[GTALUG] Sendmail Changes

[Chris Tyler]

I have a very old sendmail configuration on a VM on a dying server. I need
to move it to a stable hw platform, so I took the sendmail setup and
migrated it to a new system with a current Sendmail installation.

The previous Sendmail configuration worked fine and was trusted by remote
senders. It did not have SPF, DKIM, or DMARC set up. The new Sendmail
server worked fine (worked as expected), but was not trusted by some remote
MTAs sending TO it - including those used by Google/gmail. This seems odd
because the only real difference between the two configurations is the
Sendmail version -- something seems to have changed in the software. I
reverted to the original system after these experiments last summer, but
haven't circled back to it until now, when the failure of the underlying hw
is forcing my hand.

I haven't been following the evolution of Sendmail. I need to set up a
better long-term solution (possibly with another MTA, and definitely with
SPF+DKIM+DMARC), but in the short term I urgently need to migrate this
configuration over to a box that isn't failing. Is anyone aware of Sendmail
changes (either in behavior or defaults) that would explain how remote
servers regard the MX?

Thanks--

-Chris Tyler
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://gtalug.org/pipermail/talk/attachments/20190129/161382b9/attachment.html>