anzelmooo .:
> Hello all,
>
> Thanks for the suggestions.
>
> We changed smtp_starttls_timeout to 10s and now the messages are in the
> queue exactly 10 seconds when next hop is O365. There is no issue with
> other servers.
smtp_starttls_timeout (default: 300s)
Time limit for Postfix SMTP client write and read operations during TLS
startup and shutdown handshake procedures.
So your change will limit the delay during TLS shutdown.
> During the investigation we found out that the OpenSSL version had been
> updated from 1.0.0 to 1.0.1e and due to that the TLS connection is done via
> TLSv1.2 instead of TLSv1.
The supported Postfix versions 3.1..3.4 will be updated to avoid
the timeout during TLS shutdown. Maybe that will get into RHEL's
Postfix 2.6.6.
Wietse
