user@example.com
first.last@example.com
user+tag@example.co.uk
user_name@example.org
user%name@example.com
123456@example.cn
a@b.co
nice&simple@example.com
very.common@example.com
disposable.style.email.with+symbol@example.com
other.email-with-hyphen@example.com
fully-qualified-domain@example.com
user.name+tag+sorting@example.com
x@example.com
example-indeed@strange-example.com

plainaddress
@no-local-part.com
user@.com
user@com
user@domain..com
user@-domain.com
user@domain.com.
user name@example.com
user@domain,com
user@domain.c
user@.domain.com