When someone, who has a comma in his real name (e.g.: "Doe, John
<email@example.com>") either in from or reply-to, and the I want to reply,
squirrelmail will handle his/her name+address, as two separate addresses:
2.: "John <firstname.lastname@example.org>"
This will lead to unsuccessful delivery or delivery to an unauthorized
recipient (this actually happend to me!).