I can't sent mail  to git@vger.kernel.org with patch :) 

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain vger.kernel.org by vger.kernel.org. [209.132.180.67].

The error that the other server returned was:
550 5.7.1 Content-Policy reject msg: The message contains HTML subpart, therefore we consider it SPAM or Outlook Virus.  TEXT/PLAIN is accepted.! BF:<H 0.207609>; S1751015AbaBLJpa

I didn't find "only text/plain mail" application ))