Google Product Forums
Re: Gmail not respecting "reply to" address in my blogs contact form
Mar 7, 2013 12:21 PM
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Reading and Receiving Messages
First, Gmail is already ignoring the invalid Reply-To, which is the source of your problem.
Gmail is ignoring it, because it is invalid.
It is invalid, because Wordpress is encoding it incorrectly.
I don't think there is anything you can do directly to fix it. You need to report the problem to Wordpress, so they can fix the scripts the send messages when users fill in forms.