Please, please, <i>please</i> check your email validation... Disallowing + notation doesn't make sense, and I for one won't sign up for a service that doesn't allow it. <a href="http://i.imgur.com/xfVDKyL.png" rel="nofollow">http://i.imgur.com/xfVDKyL.png</a><p><pre><code> The local part may consist of alphabetic and numeric characters, and the following characters: !, #, $, %, &, ', *, +, -, /, =, ?, ^, _, `, {, |, } and ~, possibly with dot separators (.), inside, but not at the start, end or next to another dot separator (RFC2822 3.2.4).
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More at <a href="https://gist.github.com/EHLOVader/4531693" rel="nofollow">https://gist.github.com/EHLOVader/4531693</a>