Every once in a while, emails sent from my HTC Inspire 4g (2.3.5, sense-3.0) while using the stock email app will have text like this before the email body.

example #1
=?utf-8?B?ZWQ=?=
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="Boundary_(ID_/bWnPAvkPvr+rkl4vbO6MA)"

This is a multi-part message in MIME format.
--Boundary_(ID_/bWnPAvkPvr+rkl4vbO6MA)
Content-Type: multipart/alternative;
boundary="Boundary_(ID_/sk2UnpNoxwKEaStPqplPA)"

--Boundary_(ID_/sk2UnpNoxwKEaStPqplPA)
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable

example 2:

=?utf-8?B?ZQ==?=
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary=047d7bea451c78cec104cfce908d

--047d7bea451c78cec104cfce908d
Content-Type: multipart/alternative; boundary=047d7bea451c78cebd04cfce908b

--047d7bea451c78cebd04cfce908b
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit

i do not know what causes it. my phone does not do it consistently. Is there something that i'm doing wrong? :(