Paul Whittney wrote:
I had one problem with an email address from yahoo.com's groups, which includes an '=' inside the user portion of the email. I admit, this is perhaps outside the rules you made for the check_email_validity function, but I've got a diff if thats any help (I don't think this is a bug, perhaps something unique with a single system).
Actually, that's fairly common in systems that rewrite the envelope sender for various reasons.
VERP <http://cr.yp.to/proto/verp.txt> is a common way for mailing list software to work out exactly which subscribers are bouncing (particularly when the bounce leaves out the problem address, or the subscribed address forwards to another address that rejects the message. They don't have to use '=' as a separator, but it's in the canonical example, so it's pretty common.
SRS <http://www.openspf.org/srs.html> is intended to allow forwarders to use their own domain on re-sent messages, but preserve info about the original envelope sender so that bounces from further down the line can get back to the right place. Again, it doesn't have to use '=' (each forwarder could design its own scheme), but the reference implementations do.
So yeah, '=' will show up in the LHS of a significant number of legit envelope senders.
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