@
@example.com
abc@
abc
abc@def@example.com
#.abc@example.com # this is actually allowed!
#abc.@example.com # this is also allowed! check any "email" input in your browser.
abc@.example.com
abc@example.com.
#ab..cd@example.com # also allowed.
abc@example..com
#a@example # also allowed. idk why they think it isn't.
ab\c@example.com
"ab""c""def@example.com"
abc def@example.com
(comment)abc@example.com
abc@[255.255.255.255]
abc@(example.com
abc@x.y_y.z
abc@-example.com
abc@example-.com
abc@x.-y.z
abc@x.y-.z
abcd€f@example.com
abc@exámple.com
