использовал, я просто вас оповестил о баге, но если вы не считаете это багом, то значит все нормально.
c
http://en.wikipedia.org/wiki/E-mail_addressLocal-part is the portion of a mail address before the @ character. This normally identifies a particular mailbox within a site mail system so is not usually of interest to other mail systems.
According to RFC 2822, the local-part of the address may use any of these ASCII characters:
* Uppercase and lowercase letters
* The digits 0 through 9
* The characters ! # $ % * / ? | ^ { } ` ~ & ' + - = _
* The character . provided that it is not the first nor last character in the local-part, nor may it appear two or more times consecutively.