michel.fortin@michelf.ca
International domain names: help@tūdaliņ.lv
abc.123@example.com
1234567890@example.com
_______@example.com
abc+mailbox/department=shipping@example.com
!#$%&'*+-/=?^_`.{|}~@example.com (all of these characters are allowed)
"abc@def"@example.com (anything goes inside quotation marks)
"Fred Bloggs"@example.com
jsmith@[192.0.2.1]
"A"@example.com