search for: reject_unknown_client_hostname

Not technically a centos question, but a lot of you guys seem to manage some large systems and I could use some clarification on a postfix setting.* *reject_unknown_client_hostname (in postfix < 2.3 reject_unknown_client) When I first used this there were issues with users trying to send mail through the server from hotels, wireless spots, etc. This was solved by pushing up permit sasl_authenticated. I took it out after those issues. I read many online posts from 2008...

...elle: These are 2 different things.   Unknow hostname is a missing PTR record   For that you can use : smtpd_client_restrictions = ...   "unknown" is also the name in the case of a temporary dns lookup failure. so using 5xx for all "unknown" is not a good idea.   # reject_unknown_client_hostname: requires that the address->name and name->address mappings exist, but also that the two mappings reproduce the client IP address # reject_unknown_reverse_client_hostname: Reject the request when the client IP address has no address->name mapping. This is a weaker restriction than the rej...

...t you can use : > > > > smtpd_client_restrictions = ... > > > > > > > > "unknown" is also the name in the case of a temporary dns lookup > failure. so using 5xx for all "unknown" is not a good idea. > > > > > > > > # reject_unknown_client_hostname: requires that the address->name and > name->address mappings exist, but also that the two mappings reproduce the > client IP address > > > > # reject_unknown_reverse_client_hostname: Reject the request when the > client IP address has no address->name mapping. This is...

...ect_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, check_sender_access hash:/etc/postfix/sender_access, reject_unknown_sender_domain, reject_unknown_reverse_client_hostname, reject_unknown_client_hostname smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, check_client_access hash:/etc/postfix/rbl_override, reject_rhsbl_helo dbl.spamhaus.org, reject_rhsbl_reverse_client dbl.spamhaus.org, reject_rhsbl_sender dbl.spamhaus.org, reject_rbl_client zen.spamhaus.org -...

...are/doc/postfix sample_directory = /usr/share/doc/postfix sendmail_path = /usr/sbin/sendmail setgid_group = postdrop smtp_tls_note_starttls_offer = yes smtp_tls_security_level = may smtpd_banner = $myhostname ESMTP $mail_name smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unknown_client_hostname smtpd_helo_required = yes smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unauth_pipelining, reject_non_fqdn_recipient smtpd_relay_restrictions = smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = priva...

...maps = mysql:/etc/postfix/mysql_bcc.cf smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = Welcome to $myhostname smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, check_client_access mysql:/etc/postfix/mysql_access.cf, reject_unknown_client, reject_unknown_client_hostname, reject_unauth_pipelining, reject_rbl_client bl.spamcop.net, reject_rbl_client zen.spamhaus.org, reject_rbl_client b.barracudacentral.org smtpd_end_of_data_restrictions = check_policy_service inet:127.0.0.1:10031 smtpd_helo_required = yes smtpd_helo_restrictions = permit_mynetworks, permit_sasl_aut...

Hi list, I have noted over the last week or so my DNS servers are dumping lots of messages for bogus domain lookups. Examining the postfix queue with postqueue -p: I see many (Host or domain name not found. Name service error for name=bdgiedjhea.po6e4ina.com type=MX: Host not found, try again) Jake at bdgiedjhea.po6e4ina.com My question - why does this

Hello Please I need to add "Maurizio" to this MSSQL DB, but I don't now how to add this step in my opinion I'think that the user can't be found, so I will have the "unknown user" Can give here any little help to fix this? Feb 8 12:09:56 caloro dovecot: auth: Debug: auth client connected (pid=13300) Feb 8 12:09:56 caloro dovecot: auth: Debug: client

Hi list, I have been getting the following types of log messages Jan 30 08:22:33 ndgonline postfix/smtpd[30538]: NOQUEUE: reject: RCPT from unknown[71.46.229.50]: 450 4.7.1 Client host rejected: cannot find your hostname, [71.46.229.50]; from=<DWoodman at orangebankfl.com> to=<rkampen at ndgonline.net> proto=ESMTP helo=<mail.floridianbank.com> a rdns check shows all is well