Problem with Android forwarding emails

Dear all,
I have opened these two bug to thunderbird bugzilla and to Android mailing list:
https://bugzilla.mozilla.org/show_bug.cgi?id=780081
Issue 36774 - android - Mail - Multipart/alternative : can't view the body, because boundary parameter is not written in Content-Type - Android - An Open Handset Alliance Project - Google Project Hosting

In few words: Android (many versions) is not able to create a reply/forward email in a correct format. A "boundary=xxx" key is missing after the "multipart/alternative" in the header, so many client have problems to show the body (thunderbird shows nothing!)

Do you think ZxMobile can be the source of the problem or can help Android to work fine?
Anybody else has this problem?

Thanks