[CentOS] Up to date guide/information Sendmail SMTP Auth

Thu Mar 9 00:09:38 UTC 2017
Mark Weaver <mweaver at compinfosystems.com>

On 03/08/2017 06:42 PM, Paul Heinlein wrote:
> On Wed, 8 Mar 2017, Mark Weaver wrote:
>
> > On 03/08/2017 11:00 AM, Paul Heinlein wrote:
> >> On Wed, 8 Mar 2017, Mark Weaver wrote:
> >>
> >> > Hello all,
> >> >
> >> > I've been googling my brains out since yesterday looking for
> >> > up-to-date information on this matter, and have found
> >> > information that is anywhere from 15 to 5 years old. I'd really
> >> > like some information that much more up to date on the subject.
> >> > Specifically configuring Sendmail SMTP authentication (_no smart
> >> > host stuff_).
> >>
> >> I wrote this article years ago:
> >>
> >> https://www.madboa.com/geek/sendmail-auth/
> >>
> >> The configuration outlined there is essentially unchanged today. I
> >> have it running on a CentOS 7 machine with sendmail 8.14.
> >>
> >> The only real change is the SOCKETDIR setting in
> >> /etc/sysconfig/saslauthd, which is now /run/saslauthd (rather than
> >> /var/run/saslauthd). And, of course, I use systemctl rather
> >> thachkconfig to control boot-time behavior.
> >
> > Hi Paul,
> >
> > I followed your guide to the letter, however I think it seems I
> > missed something. When I test with telnet to port 25 this is the
> > result:
> >
> >> telnet merlin 25
> > Trying 10.10.3.6...
> > Connected to merlin.ciss.local.
> > Escape character is '^]'.
> > 220 mdw1982.com ESMTP Sendmail 8.14.7/8.13.8; Wed, 8 Mar 2017 
> 16:53:31 -0500
> > ehlo merlin
> > 250-mdw1982.com Hello [10.10.3.102], pleased to meet you
> > 250-ENHANCEDSTATUSCODES
> > 250-PIPELINING
> > 250-8BITMIME
> > 250-SIZE
> > 250-DSN
> > 250-ETRN
> > 250-DELIVERBY
> > 250 HELP
> >> auth login
> > 504 5.3.3 AUTH mechanism login not available
> >
> > thoughts?
>
> Many. :-)
>
> Check your mail log for clues.
>
> Ensure you have a valid SSL certificate and key. Sendmail is touchy
> about permissions on the key file. Try googling for
> confDONT_BLAME_SENDMAIL and GroupReadableKeyFile.
>
> Make sure saslauthd is configured and running.
>
> Compile your .mc (m4) file with the macros distributed with the
> version of sendmail you're actually running. This line suggests you're
> not:
>
> mdw1982.com ESMTP Sendmail 8.14.7/8.13.8
>
> That's a first stab at things to try.
>
I fixed the version mis-match by installing sendmail-cf package and 
recompiling sendmail.mc. saslauthd is running and conigured according to 
your specs. So, I'm not sure what's missing.