* Frank Röhm <francwal...@gmx.net> 2013.05.22 16:44:

> In the logfiles of Dovecot I don't find anything about this.

Mail.App is known to utilize many concurrent connections. Look again, most 
likely it maxes out the limit:

protocol imap {
  mail_max_userip_connections = 10
}

Regards
Thomas

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