Re: I've had similar with emails with + chars in them
Best one I had was some hand-rolled code (because no one could possibly write a better version) which "validated" email addresses. Only it did it according to the authors idea of an email address, rather than the RFC.
Now, it may be deprecated. It's certainly not advisable. But it's perfectly valid to have an apostrophe (') in an email address ... as a johnyo'rourke@somewhere.com had.