[Akonadi] [Bug 380307] IMAP fails against Exchange 2016

[quazgar]

https://bugs.kde.org/show_bug.cgi?id=380307

--- Comment #5 from quazgar <quazgar at posteo.de> ---
Thank you for reminding me!

I actually had tried all the authentication methods before posting the bug
already.  Before the upgrade to Exchange 2016, the connection used to work with
SSL/TLS on port 993 and plain authentication.

One server-side change which was announced was that from this version on, the
username would no longer be the email address but of type "$domain\$user" (the
Microsoft specific user name convention), for example "gwdg\foobar".  Another
user here found out that this did not help at all, but what did help was to
replace the correct backslash by a normal slash (which is not supposed to
work).  So what worked for her was "gwdg/foobar".  Maybe that is an excessive
interpretation of the backslash as an escape character?

I also tried this variant but unfortunately ran into the problem that
KMail/Akonadi started running into an infinite loop with automatic filtering of
messages, see the attached screenshot.  I am not sure if this has to do with my
using of Thunderbird as an intermediate solution (not sure if it was connected
to the same IMAP account simultaneously or not) or if this is linked to the
original problem.  Anyways since Akonadi did not stop to duplicate these
messages, the only way for me to keep a working computer was to disable the
account in KMail and use Thunderbird for the time being.

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