> On Jun 14, 2019, at 2:14 AM, Scott Kitterman <post...@kitterman.com> wrote:
>
> Did you check your mail logs for any warnings or errors? If you reuse a
> postfix 2.7 configuration with postfix 3.1, I'm not certain it's completely
> compatible.
Nothing major enough to cause the reported symptoms.
The only things that are vaguely related are:
* Rejection of inbound mail while the system was misconfigured,
might cause the bounced addresses to be treated as bogus for
later outbound mail.
* The change in the default value of append_dot_mydomain, could
hypothetically cause some mail to go out with just a "bare"
hostname.
My money is on the former, or something else. Without detailed
analysis of the logs, nothing useful can be said, and the whole
thing could be a coincidence. Indeed the symptoms may not even
be entirely new, just more closely watched after the upgrade.
--
Viktor.
