Here are my settings:
IMAP mailserver: imap.scarlet.be
Port: standard 143, SSL 993 (using SSL, standard is the same problem)
SMTP mailserver: smtp.scarlet.be
Port: standard 25, SSL 465 (using SSL)
Sending mails works.
Errormessage:
READ Aug 29 21:54:25.079 [kCFStreamSocketSecurityLevelTLSv1SSLv3] -- host:imap.scarlet.be -- port:993 -- socket:0x7ff01858b630 -- thread:0x7ff01208b900
3.496 BAD Mate, try AUTHENTICATE <mechanism>
Username and password are correct and worked in the synched account on my iPhone. I think, something goes wrong with Mail, maybe it sends a wrong character in the password string to the server. I can use any other password, it's always the same problem. Outlook Express on Windows is working fine, also Sparrow on my Mac (with the same settings). I think, it must be a bug in Apple Mail.