What are good email characters?

Posted on Dec 17, 2008 by Paul White

If you search for this on google you will find long drawn out explanations of how to validate email addresses.  How about just an answer?

Emails are configured like so, Local User Name  @   Domain Name

Valid Local User characters

are
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-_+

Valid Domain characters

are
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.-

With a single @ separating them.

Things to always check when validating emails

1. Only 1 @ character, that is not the first or last character
2. your first and last characters within both the username and domainname are not '.'

Now you know.

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