Weird Characters in Email Class

[eluser]Unknown[/eluser]
Hi, when sending mails through the Email class, some of the content in the body are being replaced by "=" such as this:

=======================================================================
Hi Paul Crawshaw,

You have Approved RFQ Number QTKBCVKT021100029 that was requested and prepa=ed by JONES, POORITA

Please do not reply to this email. This is a Website generated Email.
=======================================================================

Would anyone please tell me what's wrong?

Thank you..