> On May 27, 2025, at 10:21 PM, Viktor Dukhovni via Postfix-users 
> <postfix-users@postfix.org> wrote:
> 
> On Tue, May 27, 2025 at 12:22:17PM -0400, Jason Hirsh wrote:
>>> From: Jason Hirsh <kasd...@mac.com>
>>> Subject: Killed postfix
>>> Date: May 27, 2025 at 12:11:13 PM EDT
>>> To: postfix-u...@postfix.org
> 
> [ Please format list posts as simple text, rather than HTML markup. ]


Ny mail client and I don’t get alomg. Sorry
> 
>>> Since changing my SSL certficates. I have been having the following error
>>> 
>>> In:  MAIL 
>>> FROM:<incoming+verp-8bb9d4ff0fa0abc0a72c894edd68d...@letsencrypt.discoursemail.com>
>>>  SIZE=12758
>>> Out: 250 2.1.0 Ok
>>> In:  RCPT TO:<ja...@theoceanwindow.com> 
>>> ORCPT=rfc822;ja...@theoceanwindow.com
>>> Out: 451 4.3.5 Server configuration error
> 
> The details of the configuration error are in your mail log file.
> They are not shared with remote SMTP clients.
> 
>>> I am pretty sure I messed up main.cf and maybe master.cf (any thing
>>> worth breaking is worth breaking well)  as I was tweaking to deal
>>> with spam  It was working till I missed with it. Decided t aak for
>>> help before I do more damage   Mail from my local client  seem to go
>>> fine
> 
> You probably inadvertently broke something else in the config, since
> even changes that break TLS should not break recipient validation.
> 
> 
>>> My postconf -nb is
>>> 
>>> smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated 
>>> defer_unauth_destination
> 
> You'll ultimately want "reject_unauth_destination", rather than "defer",
> once your settings are otherwise stable.
> 
>>> unknown_local_recipient_reject_code = 550
> 
> That's a default setting, so not needed, however along the same lines, I
> have, which default to '4XX' as an initial safety net.
> 
>    plaintext_reject_code = 550
>    unknown_address_reject_code = 550
>    unknown_client_reject_code = 550
>    unknown_hostname_reject_code = 550
>    unverified_recipient_reject_code = 550
>    unverified_sender_reject_code = 550
> 
>>> Any suggestions would be greatly appreciated
> 
> Look in your logs, and make sure all the tables are usable,
> especially mysql and policy lookup services.
> 
> -- 
>    Viktor.
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