imaplib unexpected error

[KeefTM]

Hello, I am getting an odd error when trying to establish an IMAP
connection:

File "/Library/Frameworks/Python.framework/Versions/2.4//lib/python2.4/
imaplib.py", line 904, in _get_response
    raise self.abort("unexpected response: '%s'" % resp)
imaplib.abort: unexpected response: '220 libertydistribution.com ESMTP
CommuniGate Pro 5.0.9 is glad to see you!'

I thought 220 was the correct response, so I don't understand why I am
getting the error. Thanks!