667 - Plussed email address rejected

Signing up with an address containing a "+" in the local part is rejected. A common website programming error is to overly restrict the syntax of the local part of email addresses. Good regular expressions for checking addresses can be found here:

http://en.wikibooks.org/wiki/Programming:JavaScript:Standards_and_Best_Practices

http://simonslick.com/VEAF

The "+" in an address is an extremely useful mechanism on sendmail-based servers for classifying mail, allowing a user to track who's using an address without requiring many accounts. It's also a good way to protect from spam, by directing mail without a plus part to a spam folder.

Why is any validation done at all? The best validation is to send a confirmation to the address supplied and see if it works.

http://en.wikipedia.org/wiki/E-mail_address
http://mozilla.wikia.com/wiki/User:Me_at_work/plushaters

User	When	Change
prencher	Sun, 04 Dec 2011 06:42:01	Changed status from New to Declined
Torhal	Fri, 03 Jun 2011 17:04:27	Changed assigned to from None to prencher
Ackis	Tue, 01 Feb 2011 18:11:35	Changed component from None to Component #273
Ackis	Tue, 01 Feb 2011 18:01:29	Changed assigned to from ckknight to None
Ackis	Sat, 20 Jun 2009 18:06:28	Changed assigned to from Ackis to ckknight
Ackis	Tue, 21 Apr 2009 14:55:59	Changed assigned to from None to Ackis
SpareSimian	Wed, 01 Oct 2008 16:00:15	Create