Turns out this was caused by the way PHP talks to a mail provider provider, typically when talking to a Windows mail server. The solution was simple (once you figure it out), and involves removing the “<” section that adds the sender name so that your mail program can describe the email address it receives. That is .. change
$headers = “From: $name <$email>\n”;
to
$headers = “From: $email\n”;
Just needed to blog about it just in case I need it again.
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