CentOS - Apr 2020 - [Off topic] sending mail from Comcast was: Sendmail not working

> -----Original Message-----
> From: S.Bob
> Sent: Sunday, April 19, 2020 2:52 PM
> 
> 
> 
> I get this:
> 
> # rpm -qf `which sendmail`
> postfix-2.10.1-7.el7.x86_64
> sendmail-8.14.7-5.el7.x86_64
> 
yum erase sendmail # undo what you did before...
yum reinstall postfix # just in case it is messed up
rpm -V postfix # lets verify if postfix is ok
systemctl enable postfix # start on boot
systemctl start postfix # start it now
systemctl status postfix # see the status

# setup Xfinity / Comcast SMTP relay ISP 
	edit /etc/postfix/main.cf around line 315
	add
		relayhost = [smtp.comcast.net]


systemctl restart postfix # restart to make changes effective
systemctl status postfix # check status

echo "Subject: sendmail test4" | sendmail your_xfinity_email at
comcast.com # if this works, then test outside email

echo "Subject: sendmail test4" | sendmail kevink at psalm19pix.com #
does it get there?
> 
> 
> 
> On 4/19/20 12:39 PM, Jason Pyeron wrote:
> >> -----Original Message-----
> >> From: S.Bob
> >> Sent: Sunday, April 19, 2020 2:26 PM
> >> To: centos at centos.org
> >> Subject: Re: [CentOS] [Off topic] sending mail from Comcast was:
Sendmail not working
> >>
> >> I followed this guide:
> >>
> >>
> >> https://pepipost.com/tutorials/install-sendmail-server-centos-7/
> > Sigh - bad examples for you.... undo if you can.
> >
> > Postfix provides the "sendmail" utility.
> >
> > # rpm -qf `which sendmail`
> > postfix-2.10.1-7.el7.x86_64
> >
> >>
> >> now I get this:
> >>
> >>
> >> # echo "Subject: sendmail test4" | sendmail kevink at
psalm19pix.com
> >> [root at kdb-bugs auth]# echo "Subject: sendmail test4"
| sendmail -v
> >> kevink at psalm19pix.com
> >> kevink at psalm19pix.com... Connecting to [127.0.0.1] via relay...
> >> kevink at psalm19pix.com... Deferred: Connection reset by
[127.0.0.1]
> >> Closing connection to [127.0.0.1]
> >
> > What does /var/log/maillog say ?
> >
> >>
> >>
> >> Thoughts?
> >>
> >>
> >> On 4/19/20 11:08 AM, Jason Pyeron wrote:
> >>>> -----Original Message-----
> >>>> From: Tim Evans
> >>>> Sent: Sunday, April 19, 2020 12:50 PM
> >>>>
> >>>> On 4/19/20 12:38 PM, S.Bob wrote:
> >>>>> On 4/19/20 10:36 AM, Tim Evans wrote:
> >>>>>> On 4/19/20 12:28 PM, S.Bob wrote:
> >>>>>>> All;
> >>>>>>>
> >>>>>>>
> >>>>>>> I installed sendmail via yum, but if I test it
like this:
> >>>>>>>
> >>>>>>>
> >>>>>>> The original message was received at Sun, 19
Apr 2020 10:02:56 -0600
> >>>>>>> from localhost [127.0.0.1]
> >>>>>>>
> >>>>>>>       ----- The following addresses had
permanent fatal errors -----
> >>>>>>> <sbob at quadratum-braccas.com>
> >>>>>>>        (reason: 554 5.7.1 Service unavailable;
Client host
> >>>>>>> [50.243.150.81] blocked using
xbl.spamhaus.org.rbl.local;
> >>>>>>> https://www.spamhaus
> >>>>>>> .org/query/ip/50.243.150.81)
> >>>>>> Is 50.243.150.81 your system's IP address?  If
so, as this shows, that
> >>>>>> IP is on spamhaus' blacklist of addresses.
Thus, your sendmail is
> >>>>>> working fine.  Problem is elsewhere.
> >>>>>>
> >>>>>> anything I can do to fix it?
> >>>> Assuming this is your IP address, visit
https://www.spamhaus.org/lookup/
> >>>> and request that it be removed from the blacklisted
IP's.
> >>>>
> >>>> However, looking at the headers from your message, it
appears Comcast
> >>>> may be your ISP, and this 50.243.150.81 IP address appears
to be a
> >>>> Comcast address, so you may need to contact Comcast tech
support for
> >>>> help in getting the blacklist designation removed.
> >>> There are a few situations here.
> >>>
> >>> 1. You are a business customer with a static IP, and are
entitled to send/receive SMTP by your ISP
> >> (Comcast)
> >>> 2. You are a business/residential customer who is allowed to
send (not likely allowed to receive)
> >> SMTP and you have a domain elsewhere to receive replies to your
email
> >>> 3. You are a business/residential customer who is NOT allowed
to send SMTP except for your ISP
> >> (Comcast) provided email.
> >>> Only you would know which on for sure is you, but it is very
likely #3.
> >>>
> >>> The advice provided previously is for case #1 - contact
Comcast and inform them that your
> contracted
> >> services are not working because of .... and you will need to
beable to work with them on testing
> and
> >> suggesting fixes. They have a dedicated support phone number
(which they provided you if you are
> >> actually a #1 type customer - e.g. gigabit pro, metro Ethernet,
etc.)
> >>> In case you are a #2 or #3 type customer, you may want to use
a smart host configuration - e.g.
> >> define('SMART_HOST','[smtp.comcast.net]') . For
postfix, use relayhost = [smtp.comcast.net] .
> >>> Now when you send mail to that relay it will relay it. This is
provided you are entitled to have
> >> your email relayed - contact Xfinity customer service for help
there.
> >>> If using this relay does not work, please post the exchange
starting with the HELO (check your
> >> maillog or do it by hand with telnet).
> >>> --
> >>> Jason Pyeron  | Architect
> >>> PD Inc        |
> >>> 10 w 24th St  |
> >>> Baltimore, MD |
> >>>
> >>> .com: jpyeron at pdinc.us
> >>> tel : 202-741-9397
> >>>
> >>>
> >>>
> >>>
> >>> _______________________________________________
> >>> CentOS mailing list
> >>> CentOS at centos.org
> >>> https://lists.centos.org/mailman/listinfo/centos
> >> --
> >> `When you say "I wrote a program that crashed Windows",
people just stare at you blankly and say
> "Hey,
> >> I got those with the system, *for free*".' (By Linus
Torvalds)
> >>
> >> _______________________________________________
> >> CentOS mailing list
> >> CentOS at centos.org
> >> https://lists.centos.org/mailman/listinfo/centos
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org
> > https://lists.centos.org/mailman/listinfo/centos
> 
> --
> `When you say "I wrote a program that crashed Windows", people
just stare at you blankly and say "Hey,
> I got those with the system, *for free*".' (By Linus Torvalds)
> 
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos

my relay will be smtp.fastmail.com and it requires authentication and 
SSL, are there added settings in main.cf that will allow this?


Thanks



On 4/19/20 1:09 PM, Jason Pyeron wrote:
>> -----Original Message-----
>> From: S.Bob
>> Sent: Sunday, April 19, 2020 2:52 PM
>>
>>
>>
>> I get this:
>>
>> # rpm -qf `which sendmail`
>> postfix-2.10.1-7.el7.x86_64
>> sendmail-8.14.7-5.el7.x86_64
>>
> yum erase sendmail # undo what you did before...
> yum reinstall postfix # just in case it is messed up
> rpm -V postfix # lets verify if postfix is ok
> systemctl enable postfix # start on boot
> systemctl start postfix # start it now
> systemctl status postfix # see the status
>
> # setup Xfinity / Comcast SMTP relay ISP
> 	edit /etc/postfix/main.cf around line 315
> 	add
> 		relayhost = [smtp.comcast.net]
>
>
> systemctl restart postfix # restart to make changes effective
> systemctl status postfix # check status
>
> echo "Subject: sendmail test4" | sendmail your_xfinity_email at
comcast.com # if this works, then test outside email
>
> echo "Subject: sendmail test4" | sendmail kevink at
psalm19pix.com # does it get there?
>
>>
>>
>> On 4/19/20 12:39 PM, Jason Pyeron wrote:
>>>> -----Original Message-----
>>>> From: S.Bob
>>>> Sent: Sunday, April 19, 2020 2:26 PM
>>>> To: centos at centos.org
>>>> Subject: Re: [CentOS] [Off topic] sending mail from Comcast
was: Sendmail not working
>>>>
>>>> I followed this guide:
>>>>
>>>>
>>>>
https://pepipost.com/tutorials/install-sendmail-server-centos-7/
>>> Sigh - bad examples for you.... undo if you can.
>>>
>>> Postfix provides the "sendmail" utility.
>>>
>>> # rpm -qf `which sendmail`
>>> postfix-2.10.1-7.el7.x86_64
>>>
>>>> now I get this:
>>>>
>>>>
>>>> # echo "Subject: sendmail test4" | sendmail kevink at
psalm19pix.com
>>>> [root at kdb-bugs auth]# echo "Subject: sendmail
test4" | sendmail -v
>>>> kevink at psalm19pix.com
>>>> kevink at psalm19pix.com... Connecting to [127.0.0.1] via
relay...
>>>> kevink at psalm19pix.com... Deferred: Connection reset by
[127.0.0.1]
>>>> Closing connection to [127.0.0.1]
>>> What does /var/log/maillog say ?
>>>
>>>>
>>>> Thoughts?
>>>>
>>>>
>>>> On 4/19/20 11:08 AM, Jason Pyeron wrote:
>>>>>> -----Original Message-----
>>>>>> From: Tim Evans
>>>>>> Sent: Sunday, April 19, 2020 12:50 PM
>>>>>>
>>>>>> On 4/19/20 12:38 PM, S.Bob wrote:
>>>>>>> On 4/19/20 10:36 AM, Tim Evans wrote:
>>>>>>>> On 4/19/20 12:28 PM, S.Bob wrote:
>>>>>>>>> All;
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> I installed sendmail via yum, but if I test
it like this:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> The original message was received at Sun,
19 Apr 2020 10:02:56 -0600
>>>>>>>>> from localhost [127.0.0.1]
>>>>>>>>>
>>>>>>>>>        ----- The following addresses had
permanent fatal errors -----
>>>>>>>>> <sbob at quadratum-braccas.com>
>>>>>>>>>         (reason: 554 5.7.1 Service
unavailable; Client host
>>>>>>>>> [50.243.150.81] blocked using
xbl.spamhaus.org.rbl.local;
>>>>>>>>> https://www.spamhaus
>>>>>>>>> .org/query/ip/50.243.150.81)
>>>>>>>> Is 50.243.150.81 your system's IP address? 
If so, as this shows, that
>>>>>>>> IP is on spamhaus' blacklist of addresses.
Thus, your sendmail is
>>>>>>>> working fine.  Problem is elsewhere.
>>>>>>>>
>>>>>>>> anything I can do to fix it?
>>>>>> Assuming this is your IP address, visit
https://www.spamhaus.org/lookup/
>>>>>> and request that it be removed from the blacklisted
IP's.
>>>>>>
>>>>>> However, looking at the headers from your message, it
appears Comcast
>>>>>> may be your ISP, and this 50.243.150.81 IP address
appears to be a
>>>>>> Comcast address, so you may need to contact Comcast
tech support for
>>>>>> help in getting the blacklist designation removed.
>>>>> There are a few situations here.
>>>>>
>>>>> 1. You are a business customer with a static IP, and are
entitled to send/receive SMTP by your ISP
>>>> (Comcast)
>>>>> 2. You are a business/residential customer who is allowed
to send (not likely allowed to receive)
>>>> SMTP and you have a domain elsewhere to receive replies to your
email
>>>>> 3. You are a business/residential customer who is NOT
allowed to send SMTP except for your ISP
>>>> (Comcast) provided email.
>>>>> Only you would know which on for sure is you, but it is
very likely #3.
>>>>>
>>>>> The advice provided previously is for case #1 - contact
Comcast and inform them that your
>> contracted
>>>> services are not working because of .... and you will need to
beable to work with them on testing
>> and
>>>> suggesting fixes. They have a dedicated support phone number
(which they provided you if you are
>>>> actually a #1 type customer - e.g. gigabit pro, metro Ethernet,
etc.)
>>>>> In case you are a #2 or #3 type customer, you may want to
use a smart host configuration - e.g.
>>>> define('SMART_HOST','[smtp.comcast.net]') . For
postfix, use relayhost = [smtp.comcast.net] .
>>>>> Now when you send mail to that relay it will relay it. This
is provided you are entitled to have
>>>> your email relayed - contact Xfinity customer service for help
there.
>>>>> If using this relay does not work, please post the exchange
starting with the HELO (check your
>>>> maillog or do it by hand with telnet).
>>>>> --
>>>>> Jason Pyeron  | Architect
>>>>> PD Inc        |
>>>>> 10 w 24th St  |
>>>>> Baltimore, MD |
>>>>>
>>>>> .com: jpyeron at pdinc.us
>>>>> tel : 202-741-9397
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> CentOS mailing list
>>>>> CentOS at centos.org
>>>>> https://lists.centos.org/mailman/listinfo/centos
>>>> --
>>>> `When you say "I wrote a program that crashed
Windows", people just stare at you blankly and say
>> "Hey,
>>>> I got those with the system, *for free*".' (By Linus
Torvalds)
>>>>
>>>> _______________________________________________
>>>> CentOS mailing list
>>>> CentOS at centos.org
>>>> https://lists.centos.org/mailman/listinfo/centos
>>> _______________________________________________
>>> CentOS mailing list
>>> CentOS at centos.org
>>> https://lists.centos.org/mailman/listinfo/centos
>> --
>> `When you say "I wrote a program that crashed Windows",
people just stare at you blankly and say "Hey,
>> I got those with the system, *for free*".' (By Linus Torvalds)
>>
>> _______________________________________________
>> CentOS mailing list
>> CentOS at centos.org
>> https://lists.centos.org/mailman/listinfo/centos
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos
-- 
`When you say "I wrote a program that crashed Windows", people just
stare at you blankly and say "Hey, I got those with the system, *for
free*".' (By Linus Torvalds)

> Date: Sunday, April 19, 2020 13:47:32 -0600
> From: "S.Bob" <sbob at quadratum-braccas.com>
>
> my relay will be smtp.fastmail.com and it requires authentication
> and SSL, are there added settings in main.cf that will allow this?
What port is that delivering to -- that doesn't sound like port 25,
which is the default that an MTA delivers to.

The postfix list may be a better place to ask these configuration
questions. The general expectation there is that one has spent time
going through the documentation.

> On Apr 19, 2020, at 3:47 PM, S.Bob <sbob at quadratum-braccas.com>
wrote:
> 
> my relay will be smtp.fastmail.com <http://smtp.fastmail.com/> and it
requires authentication and SSL, are there added settings in main.cf that will
allow this?
Yes.  You?ll want to use your favorite search engine to look up "centos
postfix relayhost sasl?.  Ignore any of the wiki.centos.org
<http://wiki.centos.org/> links, they?re so out of date its embarrassing.
(for example, the HowTos/postfix_sasl_relayhost wiki page tells you to use
stunnel and an init service downloaded from a bugzilla post!)

The important thing is you?ll set up smtp_sasl_password_maps to point to a file
that has your username and password so it can authenticate against
smtp.fastmail.com:587 <http://smtp.fastmail.com:587/>.

You?ll have to make sure it goes to port 587 ? traffic from Comcast customers to
external port 25 is blocked.


--
Jonathan Billings <billings at negate.org>

> -----Original Message-----
> From: S.Bob
> Sent: Sunday, April 19, 2020 3:48 PM
> To: centos at centos.org
> Subject: Re: [CentOS] [Off topic] sending mail from Comcast was: Sendmail
not working
> 
> my relay will be smtp.fastmail.com and it requires authentication and
> SSL, are there added settings in main.cf that will allow this?
> 
No, you are using Comcast / Xfininty per your IP address 50.243.150.81.

Please follow the instuctions.
> 
> Thanks
> 
> 
> 
> On 4/19/20 1:09 PM, Jason Pyeron wrote:
> >> -----Original Message-----
> >> From: S.Bob
> >> Sent: Sunday, April 19, 2020 2:52 PM
> >>
> >>
> >>
> >> I get this:
> >>
> >> # rpm -qf `which sendmail`
> >> postfix-2.10.1-7.el7.x86_64
> >> sendmail-8.14.7-5.el7.x86_64
> >>
> > yum erase sendmail # undo what you did before...
> > yum reinstall postfix # just in case it is messed up
> > rpm -V postfix # lets verify if postfix is ok
> > systemctl enable postfix # start on boot
> > systemctl start postfix # start it now
> > systemctl status postfix # see the status
> >
> > # setup Xfinity / Comcast SMTP relay ISP
> > 	edit /etc/postfix/main.cf around line 315
> > 	add
> > 		relayhost = [smtp.comcast.net]
> >
> >
> > systemctl restart postfix # restart to make changes effective
> > systemctl status postfix # check status
> >
> > echo "Subject: sendmail test4" | sendmail your_xfinity_email
at comcast.com # if this works, then test
> outside email
> >
> > echo "Subject: sendmail test4" | sendmail kevink at
psalm19pix.com # does it get there?
> >
> >>
> >>
> >> On 4/19/20 12:39 PM, Jason Pyeron wrote:
> >>>> -----Original Message-----
> >>>> From: S.Bob
> >>>> Sent: Sunday, April 19, 2020 2:26 PM
> >>>> To: centos at centos.org
> >>>> Subject: Re: [CentOS] [Off topic] sending mail from
Comcast was: Sendmail not working
> >>>>
> >>>> I followed this guide:
> >>>>
> >>>>
> >>>>
https://pepipost.com/tutorials/install-sendmail-server-centos-7/
> >>> Sigh - bad examples for you.... undo if you can.
> >>>
> >>> Postfix provides the "sendmail" utility.
> >>>
> >>> # rpm -qf `which sendmail`
> >>> postfix-2.10.1-7.el7.x86_64
> >>>
> >>>> now I get this:
> >>>>
> >>>>
> >>>> # echo "Subject: sendmail test4" | sendmail
kevink at psalm19pix.com
> >>>> [root at kdb-bugs auth]# echo "Subject: sendmail
test4" | sendmail -v
> >>>> kevink at psalm19pix.com
> >>>> kevink at psalm19pix.com... Connecting to [127.0.0.1] via
relay...
> >>>> kevink at psalm19pix.com... Deferred: Connection reset by
[127.0.0.1]
> >>>> Closing connection to [127.0.0.1]
> >>> What does /var/log/maillog say ?
> >>>
> >>>>
> >>>> Thoughts?
> >>>>
> >>>>
> >>>> On 4/19/20 11:08 AM, Jason Pyeron wrote:
> >>>>>> -----Original Message-----
> >>>>>> From: Tim Evans
> >>>>>> Sent: Sunday, April 19, 2020 12:50 PM
> >>>>>>
> >>>>>> On 4/19/20 12:38 PM, S.Bob wrote:
> >>>>>>> On 4/19/20 10:36 AM, Tim Evans wrote:
> >>>>>>>> On 4/19/20 12:28 PM, S.Bob wrote:
> >>>>>>>>> All;
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>> I installed sendmail via yum, but if I
test it like this:
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>> The original message was received at
Sun, 19 Apr 2020 10:02:56 -0600
> >>>>>>>>> from localhost [127.0.0.1]
> >>>>>>>>>
> >>>>>>>>>        ----- The following addresses
had permanent fatal errors -----
> >>>>>>>>> <sbob at quadratum-braccas.com>
> >>>>>>>>>         (reason: 554 5.7.1 Service
unavailable; Client host
> >>>>>>>>> [50.243.150.81] blocked using
xbl.spamhaus.org.rbl.local;
> >>>>>>>>> https://www.spamhaus
> >>>>>>>>> .org/query/ip/50.243.150.81)
> >>>>>>>> Is 50.243.150.81 your system's IP
address?  If so, as this shows, that
> >>>>>>>> IP is on spamhaus' blacklist of
addresses. Thus, your sendmail is
> >>>>>>>> working fine.  Problem is elsewhere.
> >>>>>>>>
> >>>>>>>> anything I can do to fix it?
> >>>>>> Assuming this is your IP address, visit
https://www.spamhaus.org/lookup/
> >>>>>> and request that it be removed from the
blacklisted IP's.
> >>>>>>
> >>>>>> However, looking at the headers from your message,
it appears Comcast
> >>>>>> may be your ISP, and this 50.243.150.81 IP address
appears to be a
> >>>>>> Comcast address, so you may need to contact
Comcast tech support for
> >>>>>> help in getting the blacklist designation removed.
> >>>>> There are a few situations here.
> >>>>>
> >>>>> 1. You are a business customer with a static IP, and
are entitled to send/receive SMTP by your
> ISP
> >>>> (Comcast)
> >>>>> 2. You are a business/residential customer who is
allowed to send (not likely allowed to
> receive)
> >>>> SMTP and you have a domain elsewhere to receive replies to
your email
> >>>>> 3. You are a business/residential customer who is NOT
allowed to send SMTP except for your ISP
> >>>> (Comcast) provided email.
> >>>>> Only you would know which on for sure is you, but it
is very likely #3.
> >>>>>
> >>>>> The advice provided previously is for case #1 -
contact Comcast and inform them that your
> >> contracted
> >>>> services are not working because of .... and you will need
to beable to work with them on testing
> >> and
> >>>> suggesting fixes. They have a dedicated support phone
number (which they provided you if you are
> >>>> actually a #1 type customer - e.g. gigabit pro, metro
Ethernet, etc.)
> >>>>> In case you are a #2 or #3 type customer, you may want
to use a smart host configuration - e.g.
> >>>> define('SMART_HOST','[smtp.comcast.net]')
. For postfix, use relayhost = [smtp.comcast.net] .
> >>>>> Now when you send mail to that relay it will relay it.
This is provided you are entitled to have
> >>>> your email relayed - contact Xfinity customer service for
help there.
> >>>>> If using this relay does not work, please post the
exchange starting with the HELO (check your
> >>>> maillog or do it by hand with telnet).
> >>>>> --
> >>>>> Jason Pyeron  | Architect
> >>>>> PD Inc        |
> >>>>> 10 w 24th St  |
> >>>>> Baltimore, MD |
> >>>>>
> >>>>> .com: jpyeron at pdinc.us
> >>>>> tel : 202-741-9397
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>> _______________________________________________
> >>>>> CentOS mailing list
> >>>>> CentOS at centos.org
> >>>>> https://lists.centos.org/mailman/listinfo/centos
> >>>> --
> >>>> `When you say "I wrote a program that crashed
Windows", people just stare at you blankly and say
> >> "Hey,
> >>>> I got those with the system, *for free*".' (By
Linus Torvalds)
> >>>>
> >>>> _______________________________________________
> >>>> CentOS mailing list
> >>>> CentOS at centos.org
> >>>> https://lists.centos.org/mailman/listinfo/centos
> >>> _______________________________________________
> >>> CentOS mailing list
> >>> CentOS at centos.org
> >>> https://lists.centos.org/mailman/listinfo/centos
> >> --
> >> `When you say "I wrote a program that crashed Windows",
people just stare at you blankly and say
> "Hey,
> >> I got those with the system, *for free*".' (By Linus
Torvalds)
> >>
> >> _______________________________________________
> >> CentOS mailing list
> >> CentOS at centos.org
> >> https://lists.centos.org/mailman/listinfo/centos
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org
> > https://lists.centos.org/mailman/listinfo/centos
> 
> --
> `When you say "I wrote a program that crashed Windows", people
just stare at you blankly and say "Hey,
> I got those with the system, *for free*".' (By Linus Torvalds)
> 
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> https://lists.centos.org/mailman/listinfo/centos