Every time I launch Mail.app my server gets STMP authentication error

From my server STMP log file:
2015-02-23 15:48:57 plain authenticator failed for 77-173-xxx-xxx.ip.telfort.nl (mbp.home) [77.173.xxx.xxx]: 535 Incorrect authentication data (set_id=username)
For some reason Mail.app tries to connect to the STMP server but doesn't properly authenticate. It does seem to set the username but not a valid password so the log files on my SMTP server are filled with these errors. Even worse brute force detection automatically blocks the ip address in the firewall because of this after 10 attempts. It's not just me, many other customers that use a mac have the same problem (I notice this because they call me for not being able to connect because of the blacklisting by the brute force scanner)
How can I fix this? Why does Mail.app try to connect without proper authentication?

No. You said to Change the authentication setting for the account on the client to one that the server supports. But I already have that. Sending mail works just fine, but for some reason Mail.app still causes authentication errors on launch and periodically about every 10 minutes

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