Here is an interesting list of test cases, some of which parse as valid email addresses and some of which do not. If not, the page says why: http://isemail.inf

Here is an interesting list of test cases, some of which parse as valid email addresses and some of which do not. If not, the page says why: http://isemail.info/_system/is_email/test/?all http://isemail.info/_system/is_email/test/?all For example: !#$%&`*+/=?^`{|}~@iana.org is valid. Here's an essay on the subject: http://isemail.info/about http://isemail.info/about