Android Replies to Git List getting rejected

I am not 100% sure of the root cause of this, but I have gotten the following error message back from vger via GMail at least twice now:

"Delivery to the following recipient failed permanently:

      git@vger.kernel.org

 Technical details of permanent failure:
 Google tried to deliver your message, but it was rejected by the
recipient domain. We recommend contacting the other email provider for
further information about the cause of this error. The error that the
other server returned was: 550 550 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 0.0255687>;
S1755748Ab2HGTHS (state 17)."

I was replying to 20120806223113.GA16298@sigill.intra.peff.net (Subject: Re: [PATCH] Avoid crippled getpass function on Solaris). Hopefully all of the direct replies went through, but the list denied it. Some other replies have worked just fine.

Before the usual raft of "you configured your mail client incorrectly" I would like to note that such things are not configurable in the Android GMail App. If this is an app issue I'll (attempt to) take it up with them (and expect zero results). (I am writing this from the webmail interface in the hopes that it goes through.)

Am I the ONLY ONE seeing this?