Email Library, HTML MAIL- OSX Mail

[eluser]Derek Jones[/eluser]
That's quoted-printable MIME encoding. = is the escape character, e.g. =3D equates to = when decoded by the MUA. Still sounds like a line break issue to me, particularly since you mention that the mail is going through a Windows server. Do you have access to an SMTP server running on a different machine or service that you could use as a test?