On Tue, 20 Aug 2019 at 20:27:01 +0100, Dave Barton wrote:
> Suddenly today my email credentials are being rejected by the mail
> server.Is there a mail server issue?RegardsDave

Which server?  JPBerlin, for @libreoffice.org addresses?  This service
is not managed by TDF's infra team.

They disabled SASL authentication mechanisms other than PLAIN (and
LOGIN):

    $ openssl s_client -connect mail.jpberlin.de:993
    […]
    * OK [CAPABILITY IMAP4rev1 … AUTH=PLAIN AUTH=LOGIN] …

If your MUA is supporting auto-configuration with .well-known URIs that's
what it should have picked:
https://libreoffice.org/.well-known/autoconfig/mail/config-v1.1.xml

-- 
Guilhem.

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