Hi Alexander,

On Tue, 04 Jun 2019 at 12:35:48PM +0200, Alexander Koch wrote:
Dovecot (2.3.4.1 from Debian Buster) instance running on another host
via IMAP (port 143, TLS).

if this IMAP server is also listening on port 993 - could you try the following:

SOGoIMAPServer = imaps://mail.example.net;

Just to see if there's any difference.

Regards,
Markus

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