HI folks, I've an up-to-date CentOS 5.x box on a small intranet (<20 users). We did a reboot over the weekend and all appears well except that clients on the LAN can no longer send email. Just hangs/times out. No clear identifiers in the /var/log/maillog or /var/log/messages. We're not setup for ESMTP as it's a closed network and I'm really hoping for a kickstart as to where to look to get this going. In case it helps, my sendmail.cf file is below. Thanks in advance. -R divert(-1)dnl dnl # dnl # This is the sendmail macro config file for m4. If you make changes to dnl # /etc/mail/sendmail.mc, you will need to regenerate the dnl # /etc/mail/sendmail.cf file by confirming that the sendmail-cf package is dnl # installed and then performing a dnl # dnl # make -C /etc/mail dnl # include(`/usr/share/sendmail-cf/m4/cf.m4')dnl VERSIONID(`setup for linux')dnl OSTYPE(`linux')dnl dnl # dnl # Do not advertize sendmail version. dnl # dnl define(`confSMTP_LOGIN_MSG', `$j Sendmail; $b')dnl dnl # dnl # default logging level is 9, you might want to set it higher to dnl # debug the configuration dnl # dnl define(`confLOG_LEVEL', `9')dnl dnl # dnl # Uncomment and edit the following line if your outgoing mail needs to dnl # be sent out through an external mail server: dnl # dnl # define(`SMART_HOST', `smtp.your.provider')dnl dnl # define(`confDEF_USER_ID', ``8:12'')dnl dnl define(`confAUTO_REBUILD')dnl define(`confTO_CONNECT', `1m')dnl define(`confTRY_NULL_MX_LIST', `True')dnl define(`confDONT_PROBE_INTERFACES', `True')dnl define(`PROCMAIL_MAILER_PATH', `/usr/bin/procmail')dnl define(`ALIAS_FILE', `/etc/aliases')dnl define(`STATUS_FILE', `/var/log/mail/statistics')dnl define(`UUCP_MAILER_MAX', `2000000')dnl define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl define(`confAUTH_OPTIONS', `A')dnl dnl # dnl # The following allows relaying if the user authenticates, and disallows dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links dnl # dnl define(`confAUTH_OPTIONS', `A p')dnl dnl # dnl # PLAIN is the preferred plaintext authentication method and used by dnl # Mozilla Mail and Evolution, though Outlook Express and other MUAs do dnl # use LOGIN. Other mechanisms should be used if the connection is not dnl # guaranteed secure. dnl # Please remember that saslauthd needs to be running for AUTH. dnl # dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl dnl # dnl # Rudimentary information on creating certificates for sendmail TLS: dnl # cd /usr/share/ssl/certs; make sendmail.pem dnl # Complete usage: dnl # make -C /usr/share/ssl/certs usage dnl # dnl define(`confCACERT_PATH', `/etc/pki/tls/certs')dnl dnl define(`confCACERT', `/etc/pki/tls/certs/ca-bundle.crt')dnl dnl define(`confSERVER_CERT', `/etc/pki/tls/certs/sendmail.pem')dnl dnl define(`confSERVER_KEY', `/etc/pki/tls/certs/sendmail.pem')dnl dnl # dnl # This allows sendmail to use a keyfile that is shared with OpenLDAP's dnl # slapd, which requires the file to be readble by group ldap dnl # dnl define(`confDONT_BLAME_SENDMAIL', `groupreadablekeyfile')dnl dnl # dnl define(`confTO_QUEUEWARN', `4h')dnl dnl define(`confTO_QUEUERETURN', `5d')dnl dnl define(`confQUEUE_LA', `12')dnl dnl define(`confREFUSE_LA', `18')dnl define(`confTO_IDENT', `0')dnl dnl FEATURE(delay_checks)dnl FEATURE(`no_default_msa', `dnl')dnl FEATURE(`smrsh', `/usr/sbin/smrsh')dnl FEATURE(`mailertable', `hash -o /etc/mail/mailertable.db')dnl FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl FEATURE(redirect)dnl FEATURE(always_add_domain)dnl FEATURE(use_cw_file)dnl FEATURE(use_ct_file)dnl dnl # dnl # The following limits the number of processes sendmail can fork to accept dnl # incoming messages or process its message queues to 20.) sendmail refuses dnl # to accept connections once it has reached its quota of child processes. dnl # dnl define(`confMAX_DAEMON_CHILDREN', `20')dnl dnl # dnl # Limits the number of new connections per second. This caps the overhead dnl # incurred due to forking new sendmail processes. May be useful against dnl # DoS attacks or barrages of spam. (As mentioned below, a per-IP address dnl # limit would be useful but is not available as an option at this writing.) dnl # dnl define(`confCONNECTION_RATE_THROTTLE', `3')dnl dnl # dnl # The -t option will retry delivery if e.g. the user runs over his quota. dnl # FEATURE(local_procmail, `', `procmail -t -Y -a $h -d $u')dnl FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl FEATURE(`blacklist_recipients')dnl EXPOSED_USER(`root')dnl dnl # dnl # For using Cyrus-IMAPd as POP3/IMAP server through LMTP delivery uncomment dnl # the following 2 definitions and activate below in the MAILER section the dnl # cyrusv2 mailer. dnl # dnl define(`confLOCAL_MAILER', `cyrusv2')dnl dnl define(`CYRUSV2_MAILER_ARGS', `FILE /var/lib/imap/socket/lmtp')dnl dnl # dnl # The following causes sendmail to only listen on the IPv4 loopback address dnl # 127.0.0.1 and not on any other network devices. Remove the loopback dnl # address restriction to accept email from the internet or intranet. dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl dnl # dnl # The following causes sendmail to additionally listen to port 587 for dnl # mail from MUAs that authenticate. Roaming users who can't reach their dnl # preferred sendmail daemon due to port 25 being blocked or redirected find dnl # this useful. dnl # dnl DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl dnl # dnl # The following causes sendmail to additionally listen to port 465, but dnl # starting immediately in TLS mode upon connecting. Port 25 or 587 followed dnl # by STARTTLS is preferred, but roaming clients using Outlook Express can't dnl # do STARTTLS on ports other than 25. Mozilla Mail can ONLY use STARTTLS dnl # and doesn't support the deprecated smtps; Evolution <1.1.1 uses smtps dnl # when SSL is enabled-- STARTTLS support is available in version 1.1.1. dnl # dnl # For this to work your OpenSSL certificates must be configured. dnl # dnl DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl dnl # dnl # The following causes sendmail to additionally listen on the IPv6 loopback dnl # device. Remove the loopback address restriction listen to the network. dnl # dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')dnl dnl # dnl # enable both ipv6 and ipv4 in sendmail: dnl # dnl DAEMON_OPTIONS(`Name=MTA-v4, Family=inet, Name=MTA-v6, Family=inet6') dnl # dnl # We strongly recommend not accepting unresolvable domains if you want to dnl # protect yourself from spam. However, the laptop and users on computers dnl # that do not have 24x7 DNS do need this. dnl # FEATURE(`accept_unresolvable_domains')dnl dnl # dnl FEATURE(`relay_based_on_MX')dnl dnl # dnl # Also accept email sent to "localhost.localdomain" as local email. dnl # LOCAL_DOMAIN(`localhost.localdomain')dnl dnl # dnl # The following example makes mail from this host and any additional dnl # specified domains appear to be sent from mydomain.com dnl # dnl MASQUERADE_AS(`mydomain.com')dnl dnl # dnl # masquerade not just the headers, but the envelope as well dnl # dnl FEATURE(masquerade_envelope)dnl dnl # dnl # masquerade not just @mydomainalias.com, but @*.mydomainalias.com as well dnl # dnl FEATURE(masquerade_entire_domain)dnl dnl # dnl MASQUERADE_DOMAIN(localhost)dnl dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl dnl MASQUERADE_DOMAIN(mydomainalias.com)dnl dnl MASQUERADE_DOMAIN(mydomain.lan)dnl MAILER(smtp)dnl MAILER(procmail)dnl dnl MAILER(cyrusv2)dnl DAEMON_OPTIONS(`Name=smtp,Modifiers=b')
Ray Leventhal wrote:> HI folks, > > I've an up-to-date CentOS 5.x box on a small intranet (<20 users). > > We did a reboot over the weekend and all appears well except that > clients on the LAN can no longer send email. Just hangs/times out. > No clear identifiers in the /var/log/maillog or /var/log/messages. > > We're not setup for ESMTP as it's a closed network and I'm really > hoping for a kickstart as to where to look to get this going. > > In case it helps, my sendmail.cf file is below. > > Thanks in advance. > -R<snip> I should add that sendmail is definitely running :). I can telnet to the box on port 25 and get a reply, and "service sendmail status" returns 'running' with at least one pid.
HI, Check the below things on your server. 1) diskspace 2) mailq 3) netstat -ntlp |grep :25 |grep tcp 4) telnet on port 25 from server as well as from client 5) ps auxxww |grep sendmail ################you should get output like below########################### root 794 0.0 0.0 4320 648 pts/2 S+ 13:13 0:00 grep sendmail root 21186 0.0 0.2 10876 2156 ? Ss May23 0:00 sendmail: accepting connections smmsp 21195 0.0 0.1 8192 1636 ? Ss May23 0:00 sendmail: Queue runner at 01:00:00 for /var/spool/clientmqueue ######################################################################## 5) check maillog properly definitely it will throw some messages 6) check /var/log/messages . Check the maillog otherwise increase the sendmail loglevel in the sendmail.mc file to 10 and restart sendmail. Line to be changed in sendmail.mc to increase log level. dnl define(`confLOG_LEVEL', `9')dnl Regards lingu On Mon, Jun 9, 2008 at 6:33 PM, Ray Leventhal <centos at swhi.net> wrote:> HI folks, > > I've an up-to-date CentOS 5.x box on a small intranet (<20 users). > > We did a reboot over the weekend and all appears well except that clients > on the LAN can no longer send email. Just hangs/times out. No clear > identifiers in the /var/log/maillog or /var/log/messages. > > We're not setup for ESMTP as it's a closed network and I'm really hoping > for a kickstart as to where to look to get this going. > > In case it helps, my sendmail.cf file is below. > > Thanks in advance. > -R > > divert(-1)dnl > dnl # > dnl # This is the sendmail macro config file for m4. If you make changes to > dnl # /etc/mail/sendmail.mc, you will need to regenerate the > dnl # /etc/mail/sendmail.cf file by confirming that the sendmail-cf > package is > dnl # installed and then performing a > dnl # > dnl # make -C /etc/mail > dnl # > include(`/usr/share/sendmail-cf/m4/cf.m4')dnl > VERSIONID(`setup for linux')dnl > OSTYPE(`linux')dnl > dnl # > dnl # Do not advertize sendmail version. > dnl # > dnl define(`confSMTP_LOGIN_MSG', `$j Sendmail; $b')dnl > dnl # > dnl # default logging level is 9, you might want to set it higher to > dnl # debug the configuration > dnl # > dnl define(`confLOG_LEVEL', `9')dnl > dnl # > dnl # Uncomment and edit the following line if your outgoing mail needs to > dnl # be sent out through an external mail server: > dnl # > dnl # define(`SMART_HOST', `smtp.your.provider')dnl > dnl # > define(`confDEF_USER_ID', ``8:12'')dnl > dnl define(`confAUTO_REBUILD')dnl > define(`confTO_CONNECT', `1m')dnl > define(`confTRY_NULL_MX_LIST', `True')dnl > define(`confDONT_PROBE_INTERFACES', `True')dnl > define(`PROCMAIL_MAILER_PATH', `/usr/bin/procmail')dnl > define(`ALIAS_FILE', `/etc/aliases')dnl > define(`STATUS_FILE', `/var/log/mail/statistics')dnl > define(`UUCP_MAILER_MAX', `2000000')dnl > define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl > define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl > define(`confAUTH_OPTIONS', `A')dnl > dnl # > dnl # The following allows relaying if the user authenticates, and > disallows > dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links > dnl # > dnl define(`confAUTH_OPTIONS', `A p')dnl > dnl # > dnl # PLAIN is the preferred plaintext authentication method and used by > dnl # Mozilla Mail and Evolution, though Outlook Express and other MUAs do > dnl # use LOGIN. Other mechanisms should be used if the connection is not > dnl # guaranteed secure. > dnl # Please remember that saslauthd needs to be running for AUTH. > dnl # > dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl > dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 > LOGIN PLAIN')dnl > dnl # > dnl # Rudimentary information on creating certificates for sendmail TLS: > dnl # cd /usr/share/ssl/certs; make sendmail.pem > dnl # Complete usage: > dnl # make -C /usr/share/ssl/certs usage > dnl # > dnl define(`confCACERT_PATH', `/etc/pki/tls/certs')dnl > dnl define(`confCACERT', `/etc/pki/tls/certs/ca-bundle.crt')dnl > dnl define(`confSERVER_CERT', `/etc/pki/tls/certs/sendmail.pem')dnl > dnl define(`confSERVER_KEY', `/etc/pki/tls/certs/sendmail.pem')dnl > dnl # > dnl # This allows sendmail to use a keyfile that is shared with OpenLDAP's > dnl # slapd, which requires the file to be readble by group ldap > dnl # > dnl define(`confDONT_BLAME_SENDMAIL', `groupreadablekeyfile')dnl > dnl # > dnl define(`confTO_QUEUEWARN', `4h')dnl > dnl define(`confTO_QUEUERETURN', `5d')dnl > dnl define(`confQUEUE_LA', `12')dnl > dnl define(`confREFUSE_LA', `18')dnl > define(`confTO_IDENT', `0')dnl > dnl FEATURE(delay_checks)dnl > FEATURE(`no_default_msa', `dnl')dnl > FEATURE(`smrsh', `/usr/sbin/smrsh')dnl > FEATURE(`mailertable', `hash -o /etc/mail/mailertable.db')dnl > FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl > FEATURE(redirect)dnl > FEATURE(always_add_domain)dnl > FEATURE(use_cw_file)dnl > FEATURE(use_ct_file)dnl > dnl # > dnl # The following limits the number of processes sendmail can fork to > accept > dnl # incoming messages or process its message queues to 20.) sendmail > refuses > dnl # to accept connections once it has reached its quota of child > processes. > dnl # > dnl define(`confMAX_DAEMON_CHILDREN', `20')dnl > dnl # > dnl # Limits the number of new connections per second. This caps the > overhead > dnl # incurred due to forking new sendmail processes. May be useful against > dnl # DoS attacks or barrages of spam. (As mentioned below, a per-IP > address > dnl # limit would be useful but is not available as an option at this > writing.) > dnl # > dnl define(`confCONNECTION_RATE_THROTTLE', `3')dnl > dnl # > dnl # The -t option will retry delivery if e.g. the user runs over his > quota. > dnl # > FEATURE(local_procmail, `', `procmail -t -Y -a $h -d $u')dnl > FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl > FEATURE(`blacklist_recipients')dnl > EXPOSED_USER(`root')dnl > dnl # > dnl # For using Cyrus-IMAPd as POP3/IMAP server through LMTP delivery > uncomment > dnl # the following 2 definitions and activate below in the MAILER section > the > dnl # cyrusv2 mailer. > dnl # > dnl define(`confLOCAL_MAILER', `cyrusv2')dnl > dnl define(`CYRUSV2_MAILER_ARGS', `FILE /var/lib/imap/socket/lmtp')dnl > dnl # > dnl # The following causes sendmail to only listen on the IPv4 loopback > address > dnl # 127.0.0.1 and not on any other network devices. Remove the loopback > dnl # address restriction to accept email from the internet or intranet. > dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl > dnl # > dnl # The following causes sendmail to additionally listen to port 587 for > dnl # mail from MUAs that authenticate. Roaming users who can't reach their > dnl # preferred sendmail daemon due to port 25 being blocked or redirected > find > dnl # this useful. > dnl # > dnl DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl > dnl # > dnl # The following causes sendmail to additionally listen to port 465, but > dnl # starting immediately in TLS mode upon connecting. Port 25 or 587 > followed > dnl # by STARTTLS is preferred, but roaming clients using Outlook Express > can't > dnl # do STARTTLS on ports other than 25. Mozilla Mail can ONLY use > STARTTLS > dnl # and doesn't support the deprecated smtps; Evolution <1.1.1 uses smtps > dnl # when SSL is enabled-- STARTTLS support is available in version > 1.1.1. > dnl # > dnl # For this to work your OpenSSL certificates must be configured. > dnl # > dnl DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl > dnl # > dnl # The following causes sendmail to additionally listen on the IPv6 > loopback > dnl # device. Remove the loopback address restriction listen to the > network. > dnl # > dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')dnl > dnl # > dnl # enable both ipv6 and ipv4 in sendmail: > dnl # > dnl DAEMON_OPTIONS(`Name=MTA-v4, Family=inet, Name=MTA-v6, Family=inet6') > dnl # > dnl # We strongly recommend not accepting unresolvable domains if you want > to > dnl # protect yourself from spam. However, the laptop and users on > computers > dnl # that do not have 24x7 DNS do need this. > dnl # > FEATURE(`accept_unresolvable_domains')dnl > dnl # > dnl FEATURE(`relay_based_on_MX')dnl > dnl # > dnl # Also accept email sent to "localhost.localdomain" as local email. > dnl # > LOCAL_DOMAIN(`localhost.localdomain')dnl > dnl # > dnl # The following example makes mail from this host and any additional > dnl # specified domains appear to be sent from mydomain.com > dnl # > dnl MASQUERADE_AS(`mydomain.com')dnl > dnl # > dnl # masquerade not just the headers, but the envelope as well > dnl # > dnl FEATURE(masquerade_envelope)dnl > dnl # > dnl # masquerade not just @mydomainalias.com, but @*.mydomainalias.com as > well > dnl # > dnl FEATURE(masquerade_entire_domain)dnl > dnl # > dnl MASQUERADE_DOMAIN(localhost)dnl > dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl > dnl MASQUERADE_DOMAIN(mydomainalias.com)dnl > dnl MASQUERADE_DOMAIN(mydomain.lan)dnl > MAILER(smtp)dnl > MAILER(procmail)dnl > dnl MAILER(cyrusv2)dnl > DAEMON_OPTIONS(`Name=smtp,Modifiers=b') > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20080609/18798cad/attachment-0002.html>
Ray Leventhal wrote:> HI folks, > > I've an up-to-date CentOS 5.x box on a small intranet (<20 users). > > We did a reboot over the weekend and all appears well except that > clients on the LAN can no longer send email. Just hangs/times out. > No clear identifiers in the /var/log/maillog or /var/log/messages.inserted update: It does appear there's something in /var/log/maillog. I found this entry, repeated a few times for users (now that they're here and using the system). Jun 9 09:10:49 gungho sendmail[13074]: m59D9b47013074: lost input channel from [172.16.0.155] to smtp after mail> We're not setup for ESMTP as it's a closed network and I'm really > hoping for a kickstart as to where to look to get this going. > > In case it helps, my sendmail.cf file is below. > > Thanks in advance. > -R > <snip>
lingu wrote: Hi lingu, Thanks for your reply.> Check the below things on your server. > > 1) diskspacedf -h shows 253GB free on the LVM which holds mail> > 2) mailqmailq says 'mailqueue is empty'> > 3) netstat -ntlp |grep :25 |grep tcp# netstat -ntlp|grep :25|grep tcp tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 12861/sendmail: acc> > 4) telnet on port 25 from server as well as from clientconnects with the following, from either server or lan client: 220 gungho.prvnet ESMTP Sendmail 8.13.8/8.13.8; Mon, 9 Jun 2008 09:27:59 -0400> > 5) ps auxxww |grep sendmail > ################################################ ps auxwww|grep sendmail root 12861 0.0 0.2 8960 1920 ? Ss 08:42 0:00 sendmail: accepting connections smmsp 12869 0.0 0.1 8012 1484 ? Ss 08:42 0:00 sendmail: Queue runner at 01:00:00 for /var/spool/clientmqueue root 13249 0.0 0.0 3892 688 pts/2 S+ 09:28 0:00 grep sendmail> > 5) check maillog properly definitely it will throw some messagesThe only interesting thing here is: Jun 9 09:10:49 gungho sendmail[13074]: m59D9b47013074: lost input channel from [172.16.0.155] to smtp after mail> > 6) check /var/log/messages . >nothing unusual in the messages file.> > > Check the maillog otherwise increase the sendmail loglevel in the > sendmail.mc <http://sendmail.mc> file to 10 and restart sendmail. > > Line to be changed in sendmail.mc <http://sendmail.mc> to increase log > level. > > dnl define(`confLOG_LEVEL', `9')dnldone. I'll re-check logs now as well.> > Regards > linguThanks for your suggestions. I'll reply with status shortly -Ray
lists-centos wrote:> are you configured for spamassassin or clamav as milters on the > server (in the sendmail.cf) and either/both of these didn't start up > on the reboot? sendmail will still accept mail with sa/clamav not > running, but it takes a bit longer. > there's also the possibility of an inverse-map lookup on the > ipnumbers of the inbound client machines. if the server is trying to > do the lookups but is having trouble reaching the appropriate > in-addr.arpa server you'll get long hangs. > > - Rick >Hi Rick, no milters are configured...this is a really small intranet with absolutely no connectivity to the outside world. I'm baffled. Regarding your mention of a dns issue...it may be, but i'm still baffled as this was all working before the weekend. I rebooted the box on Sunday and am in this <pun intended> bind today :) Thanks for your input...much appreciated. -R
<snip>> > where does the server point to for its dns? if it's (supposed to be) > running a nameserver (e.g., you're pointing to 127.0.0.1) but the dns > server isn't running you'll get a timeout. if you have a second > nameserver configured in /etc/resolv.conf you'll likely ultimately > get a response, but only after you time out on the first. > > by the way, you may want to look at the server's "client" sendmail > queue ("mailq -Ac"). the remote clients dump to the regular queue > (/var/spool/mqueue), but localhost mail goes into the clientmqueue > (/var/spool/clientmqueue). if mail is hanging there it might give > hints that are easier to debug than are remote connections. [you may > also want to try originating mail from localhost and see what > happens.] > > > > - Rick > >The server points to another server on the network for dns, which is running and accepting queries on 53, as expected. resolv.conf points to the correct nameserver IP. I'll check the client queue..hadn't thought of that. Thanks, -Ray
on 6-9-2008 6:03 AM Ray Leventhal spake the following:> HI folks, > > I've an up-to-date CentOS 5.x box on a small intranet (<20 users). > > We did a reboot over the weekend and all appears well except that > clients on the LAN can no longer send email. Just hangs/times out. No > clear identifiers in the /var/log/maillog or /var/log/messages. > > We're not setup for ESMTP as it's a closed network and I'm really hoping > for a kickstart as to where to look to get this going. > > In case it helps, my sendmail.cf file is below. > > Thanks in advance. > -R > > divert(-1)dnl > dnl # > dnl # This is the sendmail macro config file for m4. If you make changes to > dnl # /etc/mail/sendmail.mc, you will need to regenerate the > dnl # /etc/mail/sendmail.cf file by confirming that the sendmail-cf > package is > dnl # installed and then performing a > dnl # > dnl # make -C /etc/mail > dnl # > include(`/usr/share/sendmail-cf/m4/cf.m4')dnl > VERSIONID(`setup for linux')dnl > OSTYPE(`linux')dnl > dnl # > dnl # Do not advertize sendmail version. > dnl # > dnl define(`confSMTP_LOGIN_MSG', `$j Sendmail; $b')dnl > dnl # > dnl # default logging level is 9, you might want to set it higher to > dnl # debug the configuration > dnl # > dnl define(`confLOG_LEVEL', `9')dnl > dnl # > dnl # Uncomment and edit the following line if your outgoing mail needs to > dnl # be sent out through an external mail server: > dnl # > dnl # define(`SMART_HOST', `smtp.your.provider')dnl > dnl # > define(`confDEF_USER_ID', ``8:12'')dnl > dnl define(`confAUTO_REBUILD')dnl > define(`confTO_CONNECT', `1m')dnl > define(`confTRY_NULL_MX_LIST', `True')dnl > define(`confDONT_PROBE_INTERFACES', `True')dnl > define(`PROCMAIL_MAILER_PATH', `/usr/bin/procmail')dnl > define(`ALIAS_FILE', `/etc/aliases')dnl > define(`STATUS_FILE', `/var/log/mail/statistics')dnl > define(`UUCP_MAILER_MAX', `2000000')dnl > define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl > define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl > define(`confAUTH_OPTIONS', `A')dnl > dnl # > dnl # The following allows relaying if the user authenticates, and > disallows > dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links > dnl # > dnl define(`confAUTH_OPTIONS', `A p')dnl > dnl # > dnl # PLAIN is the preferred plaintext authentication method and used by > dnl # Mozilla Mail and Evolution, though Outlook Express and other MUAs do > dnl # use LOGIN. Other mechanisms should be used if the connection is not > dnl # guaranteed secure. > dnl # Please remember that saslauthd needs to be running for AUTH. > dnl # > dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl > dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 > LOGIN PLAIN')dnl > dnl # > dnl # Rudimentary information on creating certificates for sendmail TLS: > dnl # cd /usr/share/ssl/certs; make sendmail.pem > dnl # Complete usage: > dnl # make -C /usr/share/ssl/certs usage > dnl # > dnl define(`confCACERT_PATH', `/etc/pki/tls/certs')dnl > dnl define(`confCACERT', `/etc/pki/tls/certs/ca-bundle.crt')dnl > dnl define(`confSERVER_CERT', `/etc/pki/tls/certs/sendmail.pem')dnl > dnl define(`confSERVER_KEY', `/etc/pki/tls/certs/sendmail.pem')dnl > dnl # > dnl # This allows sendmail to use a keyfile that is shared with OpenLDAP's > dnl # slapd, which requires the file to be readble by group ldap > dnl # > dnl define(`confDONT_BLAME_SENDMAIL', `groupreadablekeyfile')dnl > dnl # > dnl define(`confTO_QUEUEWARN', `4h')dnl > dnl define(`confTO_QUEUERETURN', `5d')dnl > dnl define(`confQUEUE_LA', `12')dnl > dnl define(`confREFUSE_LA', `18')dnl > define(`confTO_IDENT', `0')dnl > dnl FEATURE(delay_checks)dnl > FEATURE(`no_default_msa', `dnl')dnl > FEATURE(`smrsh', `/usr/sbin/smrsh')dnl > FEATURE(`mailertable', `hash -o /etc/mail/mailertable.db')dnl > FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl > FEATURE(redirect)dnl > FEATURE(always_add_domain)dnl > FEATURE(use_cw_file)dnl > FEATURE(use_ct_file)dnl > dnl # > dnl # The following limits the number of processes sendmail can fork to > accept > dnl # incoming messages or process its message queues to 20.) sendmail > refuses > dnl # to accept connections once it has reached its quota of child > processes. > dnl # > dnl define(`confMAX_DAEMON_CHILDREN', `20')dnl > dnl # > dnl # Limits the number of new connections per second. This caps the > overhead > dnl # incurred due to forking new sendmail processes. May be useful against > dnl # DoS attacks or barrages of spam. (As mentioned below, a per-IP > address > dnl # limit would be useful but is not available as an option at this > writing.) > dnl # > dnl define(`confCONNECTION_RATE_THROTTLE', `3')dnl > dnl # > dnl # The -t option will retry delivery if e.g. the user runs over his > quota. > dnl # > FEATURE(local_procmail, `', `procmail -t -Y -a $h -d $u')dnl > FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl > FEATURE(`blacklist_recipients')dnl > EXPOSED_USER(`root')dnl > dnl # > dnl # For using Cyrus-IMAPd as POP3/IMAP server through LMTP delivery > uncomment > dnl # the following 2 definitions and activate below in the MAILER > section the > dnl # cyrusv2 mailer. > dnl # > dnl define(`confLOCAL_MAILER', `cyrusv2')dnl > dnl define(`CYRUSV2_MAILER_ARGS', `FILE /var/lib/imap/socket/lmtp')dnl > dnl # > dnl # The following causes sendmail to only listen on the IPv4 loopback > address > dnl # 127.0.0.1 and not on any other network devices. Remove the loopback > dnl # address restriction to accept email from the internet or intranet. > dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl > dnl # > dnl # The following causes sendmail to additionally listen to port 587 for > dnl # mail from MUAs that authenticate. Roaming users who can't reach their > dnl # preferred sendmail daemon due to port 25 being blocked or > redirected find > dnl # this useful. > dnl # > dnl DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl > dnl # > dnl # The following causes sendmail to additionally listen to port 465, but > dnl # starting immediately in TLS mode upon connecting. Port 25 or 587 > followed > dnl # by STARTTLS is preferred, but roaming clients using Outlook > Express can't > dnl # do STARTTLS on ports other than 25. Mozilla Mail can ONLY use > STARTTLS > dnl # and doesn't support the deprecated smtps; Evolution <1.1.1 uses smtps > dnl # when SSL is enabled-- STARTTLS support is available in version 1.1.1. > dnl # > dnl # For this to work your OpenSSL certificates must be configured. > dnl # > dnl DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl > dnl # > dnl # The following causes sendmail to additionally listen on the IPv6 > loopback > dnl # device. Remove the loopback address restriction listen to the > network. > dnl # > dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')dnl > dnl # > dnl # enable both ipv6 and ipv4 in sendmail: > dnl # > dnl DAEMON_OPTIONS(`Name=MTA-v4, Family=inet, Name=MTA-v6, Family=inet6') > dnl # > dnl # We strongly recommend not accepting unresolvable domains if you > want to > dnl # protect yourself from spam. However, the laptop and users on > computers > dnl # that do not have 24x7 DNS do need this. > dnl # > FEATURE(`accept_unresolvable_domains')dnl > dnl # > dnl FEATURE(`relay_based_on_MX')dnl > dnl # > dnl # Also accept email sent to "localhost.localdomain" as local email. > dnl # > LOCAL_DOMAIN(`localhost.localdomain')dnl > dnl # > dnl # The following example makes mail from this host and any additional > dnl # specified domains appear to be sent from mydomain.com > dnl # > dnl MASQUERADE_AS(`mydomain.com')dnl > dnl # > dnl # masquerade not just the headers, but the envelope as well > dnl # > dnl FEATURE(masquerade_envelope)dnl > dnl # > dnl # masquerade not just @mydomainalias.com, but @*.mydomainalias.com > as well > dnl # > dnl FEATURE(masquerade_entire_domain)dnl > dnl # > dnl MASQUERADE_DOMAIN(localhost)dnl > dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl > dnl MASQUERADE_DOMAIN(mydomainalias.com)dnl > dnl MASQUERADE_DOMAIN(mydomain.lan)dnl > MAILER(smtp)dnl > MAILER(procmail)dnl > dnl MAILER(cyrusv2)dnl > DAEMON_OPTIONS(`Name=smtp,Modifiers=b')All your Daemon_options (`port... definitions are turned off (dnl). You have effectively told sendmail to not listen to anybody. At a minimum you need "DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')" turned on for local mail to move, or "DAEMON_OPTIONS(`Port=smtp, Name=MTA')" to listen to all interfaces. -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!! -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 258 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20080609/41ae5305/attachment-0002.sig>
<big snip>> All your Daemon_options (`port... definitions are turned off (dnl). > You have effectively told sendmail to not listen to anybody. > At a minimum you need "DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, > Name=MTA')" turned on for local mail to move, or > "DAEMON_OPTIONS(`Port=smtp, Name=MTA')" to listen to all interfaces. >Hi Scott, Thanks for your reply. I had this in the file posted: dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl but I"ll change it to DAEMON_OPTIONS(`Port=smtp, Name=MTA') based on your suggestion. Thanks, -Ray