On 08/09/2019 12:42 Henrik Johansson via dovecot <dovecot@dovecot.org> wrote:

On 4 Sep 2019, at 21:35, Jean-Daniel < jddupas@xooloo.com> wrote:

Just a wild guess as I didn’t try to configure Mail on Catalina yet, but it looks like your server only supports ‘DHE-RSA…’ ciphers.
I think that modern systems prefers using ECDHE key exchange and would not be surprise if iOS requires it.

Well I got the OpenSSL parts working now, but newer versions still refuses to work after establishing with ECDHE, I just get no login attempts and no user:

imap-login: Info: Aborted login (no auth attempts in 0 secs): user=<>, rip=55.66.77.88, lip=11.22.33.44, TLS, TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)

Regards

Henrik

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Aki Tuomi