Hi Danielolima,
Are you using PGP/MIME for the encoding? If not, please try it and let us know the outcome.
Can you post a test "raw message" here, particularly the mail headers?
If required, remove identifiable information, except the ones in these headers below. Also there's no need for the encoded data, please snip it out.
Accept-Language:
Content-Language:
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage:
MIME-Version:
Content-Type:
Content-Transfer-Encoding:
Thanks and regards,
dcats