Problems with mails signed in PGP 10.2.0 MP3

Hello,

I have a computer with Windows XP SP3, Office 2010 and PGP 10.2.0 MP3 (the Exchange server is 2010)

I have generate my key and the new mails signed (no encrypted), PGP log tells me that mail is signed but the mail never arrive (i have sent to differents domains) Mails send without sign are received.

My desktop is behind the FW, I checked the 465 port to Exchange Servers and is opened.

Any ideas?

Thanks and Regards!