Code in email??

A friend uses Incredimail, gets lots of coding in her emails. Sometimes she can’t even read the message – Shortened Example below. How can we get rid of it?
There must be some setting to uncheck or ???
Thanks for any help!
Cesle
————–Boundary-00=3D_VM4PXFP0000000000000

Content-Type: Text/HTML; charset=3D”iso-8859-1″
Content-Transfer-Encoding: quoted-printable