Hello, I may be mistaken, but I don't see "auth_mechanism = plain login" in your configuration. It's possible that you are using something different for authentication, but I don't see it in the configuration.
On Wed, May 17, 2023 at 4:04 PM Ralf Becker via dovecot <dovecot@dovecot.org> wrote: > Dovecot 2.3.20 including it's submission server works well with all > sorts of clients, but Outlook. > > Outlook works / can connect to Dovecot IMAP service with same > certificate TLS config, but it fails to connect using SMTPs on port 465. > Other clients connect and send mails without problem, also openssl > s_client can connect and reports no problems. > > I tried with Outlook Version 365 on Windows 11 (no cloud) and > "Microsoft® Outlook® 2021 MSO (Version 2304 Build 16.0.16327.20200) > 64-bit". > > I already enabled all submission_client_workarounds and lowered > min_ssl_version from TLSv1.2 to TLSv1, but that changed nothing. > > I can see nothing failing in the logs, thought the OL connection wizard > always check IMAP and SMTP together, so it's hard to say what the > problem is. > > The same two Outlook version connect without a problem to Postfix > authenticating via SASL to Dovecot also requiring a minimum TLS version > of 1.2. > They just wont connect with Dovecot submission server. > > Any ideas what's wrong, or how to debug that further? > > Ralf > > -- > > Ralf Becker > EGroupware GmbH [www.egroupware.org] > Handelsregister HRB Kaiserslautern 3587 > Geschäftsführer Birgit und Ralf Becker > Leibnizstr. 17, 67663 Kaiserslautern, Germany > Telefon +49 631 31657-0 > _______________________________________________ > dovecot mailing list -- dovecot@dovecot.org > To unsubscribe send an email to dovecot-le...@dovecot.org > -- Andrzej
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