What characters are allowed in an email address?

Question

I\'m not asking about full email validation.

I just want to know what are allowed characters in user-name and server parts of email address

Answer 1

A good read on the matter.

Excerpt:

These are all valid email addresses!

"Abc\@def"@example.com
"Fred Bloggs"@example.com
"Joe\\Blow"@example.com
"Abc@def"@example.com
customer/department=shipping@example.com
\$A12345@example.com
!def!xyz%abc@example.com
_somename@example.com