Contact Form (possible) bug

I am using the Jetpack Contact form, and have run into a possible bug.

I find that when I build the form with a Name field the outgoing email works. When the name field is deleted from the contact form, then the Jetpack contact module causes a mal-formed Reply To address. My host server (Bluehost) refuses to accept the email because in the Reply To field the email address is repeated as a name, i.e.:

Reply-To: [email protected] <[email protected]>

This mal-formed header address is one of several examples listed that will not be accepted by the server as seen in Bluehost KB doc # 206:

**********************************************************
Examples of headers that will NOT work:

From: “[email protected]”
From: user @ domain.com
From: [email protected] <[email protected]>
**********************************************************

This double email declaration is out of compliance with RFC 2822, so this is not just a Bluehost peculiarity. That RFC states (some examples of proper format):

[email protected]
[email protected], [email protected]
User <[email protected]>

The clue for the emails not going out was in the server error log, which shows the double declaration of the email address:

**********************************************************
+++ 1VPhDC-0007Av-6L has not completed +++
2013-09-27 17:12:38 1VPhDC-0007Av-6L H=localhost (boxxxx.bluehost.com) [100.0.0.0]:4xxx5 F=<[email protected]> rejected after DATA: syntax error in ‘Reply-To:’ header when scanning for sender: malformed address: <[email protected]> may not follow [email protected] in “[email protected] <[email protected]>”
**********************************************************

This seems to be a bug in the Jetpack contact module, in that when the Name field is deleted from the form it just repeats the email address as the name. This presents as a problem with some email servers.

This error is also true if the Name field is made optional, and then left blank by the site visitor.

And as a note, the sendmail_path has these three flags set:

-t -i -f

Am I missing something here or is this really a bug in the Jetpack Contact form??

bc

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