Wesley Peng: > Hello, > > Is there the username specification for email system? > It seems most special characters like ".", "-", "+", "_", "#", "$" are > permitted in the username part. > And even ___username...@domain.com is right (like my sender account). > So I was confused.
Email RFCs allow many localpart forms, but common sense limits that
to a mix of -+_.a-z0-9, leaving all the special characters for use
by the mail system.
Wietse
