On Thu, Sep 05, 2019 at 03:45:47PM +0800, Wesley Peng wrote:
> Is there the username specification for email system?

It is called "local-part". And yes, RFC 5321 and 5322 have a pretty
comprehensive spec for it.

The following is a valid e-mail address for example:
"<script>alert('Ohhai')</script>"@43-1.org

Regards,
Bastian

-- 
It is undignified for a woman to play servant to a man who is not hers.
                -- Spock, "Amok Time", stardate 3372.7

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