On 14 Apr 2021, at 5:47, (lists) Denis BUCHER wrote:
Hello everyone,
It's very strange, but without changing anything in the configuration
of Postfix, we have corrupted SMTP transactions from Thunderbird bêta
(Windows) and Outlook (MacOS) but not from command line (Linux) and
not from Thunderbird release (Windows).
The transaction looks like this :
[ malformatted and excessively verbose log & postconf -n snipped ]
It's really extremely strange, I cannot even find what the cause could
be ?
If anyone had any suggestion, or at least an idea, it would be great !
Thanks a lot in advance for any help !
Critical evidence is missing: "postconf -Mf" output and non-verbose logs
of successful sessions. So what follows is a possibility, not a
certainty...
Your problem is consistent with your 'smtps' service (port 465) not
having the critical "-o smtpd_tls_wrappermode=yes" argument enabled in
master.cf. The differences between clients is likely due to different
configurations and/or differences in how clients attempt to probe the
server for the best connection configuration.
Non-verbose logs from both working and non-working sessions with the
addition of "smtpd_tls_loglevel = 1" to your configuration may reveal
that the working clients are either connecting to the plain smtp or
submission services or are somehow accommodating the lack of implicit
TLS on port 465.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
