On Thu, Mar 27, 2025 at 10:27:06PM -0500, victoria crenshaw wrote:
> > > Mostly timing out or refusal of connection to the postfix server.
> > > I checked the iptables and cleared the fail2ban stuff it is cleared
> >
> > Are there really no relevant warnings in your logs (other than
> > warnings about unknown hostnames from bot connections)? If
> > your server is not responsive, it is usually because there's
> > a problem that shows up in the logs.
>
> 2025-03-27T23:24:01.502064-04:00 johnreedcenter postfix/trivial-
> rewrite[671022]: warning: do not list domain johnreedcenter.net in BOTH
> mydestination and virtual_alias_domains
> 2025-03-27T23:24:01.502225-04:00 johnreedcenter postfix/trivial-
> rewrite[671022]: warning: do not list domain johnreedcenter.net in BOTH
> mydestination and virtual_alias_domains
Well, don't do that! Is the domain a virtual alias domain (with all
addresses rewritten to other domains, ...) or is a local domain
(users have system accounts, and/or /etc/aliases(5) is used to
handle lists, ...)? See ADRESS_CLASS_README.
> it is just johnreedcenter.net not mail.johnreedcenter.net
If nothing is using "mail.johnreedcenter.net", perhaps delete that
name from DNS, though that is not relevant to the issue at hand.
One immediate observation is to drop the "verbose" flag from your
"smtp/inet" master.cf entry. This can significanly degrade performance
of inbound mail handling.
# postconf -Mf
smtp inet n - y - - smtpd -v
Are some of your users trying to use port 25 instead of 587 or 465?
Are there any warnings from "master" about the submission services
reaching their process limit?
--
Viktor.
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