On Mon, Dec 15, 2025 at 08:30:34AM +0000, ml+mailop--- via mailop wrote:
> On Mon, Dec 15, 2025, Ralf Hildebrandt via mailop wrote:
>
> > > Just curious: does your server log a TLS related error?
>
> > Dec 9 13:04:01 mail-cbf-int extern/smtpd[4088632]: NOQUEUE: lost
> > connection after STARTTLS from
> > de-smtp-delivery-58.mimecast.com[194.104.109.58]
> >
>
> Does that mean there was no TLS related error?
> Or are details only logged at a higher "debug" level?
> Something like:
>
> client_ip=162.130.196.227, client_name=smtp01.marriott.com,
> description=error:141A20F4:SSL
> routines:ossl_statem_server_read_transition:unexpected message,
> file=ssl/statem/statem_srvr.c, line=313
When the SMTP client simply closes the TLS connection, perhaps because
it does not like the server's certificate, there is no TLS error as
such, unless the client sends a TLS "alert". So "connection lost" is
one of the possible outcomes. Especially if the TLS handshake
completes, and the connection is only then closed.
Postfix is even more "polite" in such cases, and sends "QUIT<CRLF>" as
the first command after the handshake completes.
--
Viktor. 🇺🇦 Слава Україні!
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