The + sign is valid in the local part of an email address. Please fix the validation on your sign up form.
From now on I’m going to keep track of sites to which I’ve had to send a variation of the above message. There are only two reasons for disallowing it: technical incompetence and a failure to read the RFCs; or malice in not wanting users to identify spammers or sellers of email addresses to spammers by disallowing tagged email addresses.
Fixed
- monitis.com
Pending
- demand.five.tv (29/11/2009)
- store.steampowered.com (23/05/2010)
Refusing to change
- evony.com
- unvarnished.com