I use incredimail and all mail Im sending bounce with the following error:

Subject: Mail delivery failed: returning message to sender
This message was created automatically by mail delivery software (Exim).

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected] ( a valid address)

This message has been rejected because it has
an overlength date field which can be used
to subvert Microsoft mail programs
The following URL has further information

any idea ? How I can fix it ?