On Tue, 11 Jun 2024 at 16:14, Noel Jones via Postfix-users < postfix-users@postfix.org> wrote:
> If you need permit_mx_backup, that means postfix doesn't have a > clear idea of domains it is responsible for. > > Please read and study: > http://www.postfix.org/BASIC_CONFIGURATION_README.html > > mydestination should contain domains that are delivered locally by > postfix on the same machine. > > relay_domains should contain a list of all domains that are passed > further downstream for final delivery outside of "this" postfix, > such as to another process on the same server, or to a different server. > > It shouldn't be that hard to tell postfix what domains it is > responsible for. > > Apologies - I've confused the conversation with my question about permit_mx_backup. The server has been working with its present configuration using permit_mx_backup for almost a decade (and keeping out of RBLs, etc. in that time). I don't doubt there are some suboptimal things going on in the configs, but I'd rather not tinker with them. What I understand is that in my proposed *new* (and untested, hence my posting here) configuration https://pastebin.com/2X8gqVVq - permit_mx_backup isn't going to be needed. Further, I think I should look at de-duplicating the smtpd configs in master.cf as suggested, and also look at using postscreen. That said, I think I'll enlist some professional help in all this, as debugging the details on the mailing list seems rather more tricky than I'd expected :-)
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