[MlMt] Strange issue with exchange imap

["Stephan Bösebeck"]

Hi,

for work, I use an exchange with open imap/s ports. Unfortunately it stopped working and I can't find out why. Trying the imap account directly with `openssl` works fine, also when adding an imap account to Apple Mail for example, it also works.

In MailMate I get these Logs in Activity viewer:


```
07:53:39 Handling reply
07:53:39 Error: Failed multiple retries (4). Final error code was 11.
07:53:39 Terminating non-running connection...
07:53:49 Running action
07:53:49 Handling request
07:53:49 Clearing connection to owa.genios.de
07:53:49 Ready to run action (type: 1000, retry count: 0)
07:53:49 Clearing connection to owa.genios.de
07:53:49 Trying to connect to owa.genios.de on port 993 (CFNetwork) without STARTTLS (required)
07:53:49 Resolved hostname (owa.genios.de).
07:53:49 Prepare secure connection...
07:53:49 Successful connection.
07:53:49 Initiating secure connection...
07:53:49  Returned (4)...
07:53:49 Protocol version: kTLSProtocol12
07:54:00 Trying to terminate connection...
07:54:00 S: <<< terminated reading >>>
07:54:00 Clearing connection to owa.genios.de
07:54:00 Error code: 12
07:54:00 Failed action (1000). Reset observed read/write timeouts: 8/8

07:54:00 Trying to terminate connection...
07:54:00 S: <<< terminated reading >>>
07:54:00 Clearing connection to owa.genios.de
07:54:00 Error code: 12
07:54:00 Failed action (1000). Reset observed read/write timeouts: 8/8
07:54:00 Handling reply
07:54:30 Running action
07:54:30 Handling request
07:54:30 Clearing connection to owa.genios.de
07:54:30 Ready to run action (type: 1000, retry count: 0)
07:54:30 Clearing connection to owa.genios.de
07:54:30 Trying to connect to owa.genios.de on port 993 (CFNetwork) without STARTTLS (required)
07:54:30 Resolved hostname (owa.genios.de).
07:54:30 Prepare secure connection...
07:54:31 Successful connection.
07:54:31 Initiating secure connection...
07:54:31  Returned (4)...
07:54:31 Protocol version: kTLSProtocol12
07:55:52 S:
07:55:52 Error code: 11
07:55:52 New timeout values (8/8): 121/121
07:55:52 Failed action (1000). Reset observed read/write timeouts: 8/8
```

I am not sure, if this is an issue with Mailmate (actualy I doubt that), but maybe someone can point me in the right direction... right now, I have to use MailMate with `Davmail`-Proxy, which causes Mailmate to resynchronize some folders over and over...

Thanks,

Stephan
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