The cause of the problem is that the Ant Suite adds a header to the outgoing mail, and recently this header has become longer than the space reserved for it, overwriting the line feed. People using some other mail programs with the Ant suite - such as Messenger and Pluto - won't have the same problem as they use their own transport mechanisms; but all email clients will have problems reading such a message. If you receive an email that appears to be blank or have had the top chopped off, and your email client has the capability of showing full headers, you may find that you can read the rest of the text that way.
The fix has been released by "The" Paul Vigay (sorry, no new photo), and is available from his website.
Source: Paul Vigay