I've been on many teams in my whole testing career, and for some reason, I always end up getting assigned to validate the email address field.  So after numerous times of hunting down my old email test cases from previous team, I am giving up.  I thought I am just going to list out all of them here out on the internet.  I know that I probably going to have to refer to this list again and again in the future.  Might as well help benefit others like me.

Here is the list of valid and invalid email format which can be used for testing.  The list is not comprehensive by any means, and is probably missing a bunch of edge cases.  However, it provides enough coverage for the majority of the allowed/disallowed email address according to RFC 2822.

BTW, if anyone else would like to contribute more cases to this list, or spot errors (fingers crossed), please feel free to let me know and I'll make sure the list is up-to-date.

Valid Email address Reason
email@domain.com Valid email
firstname.lastname@domain.com Email contains dot in the address field
email@subdomain.domain.com Email contains dot with subdomain
firstname+lastname@domain.com Plus sign is considered valid character
email@123.123.123.123 Domain is valid IP address
email@[123.123.123.123] Square bracket around IP address is considered valid
"email"@domain.com Quotes around email is considered valid
1234567890@domain.com Digits in address are valid
email@domain-one.com Dash in domain name is valid
_______@domain.com Underscore in the address field is valid
email@domain.name .name is valid Top Level Domain name
email@domain.co.jp Dot in Top Level Domain name also considered valid (use co.jp as example here)
firstname-lastname@domain.com Dash in address field is valid

 

Invalid Email address Reason
plainaddress Missing @ sign and domain
#@%^%#$@#$@#.com Garbage
@domain.com Missing username
Joe Smith <email@domain.com> Encoded html within email is invalid
email.domain.com Missing @
email@domain@domain.com Two @ sign
.email@domain.com Leading dot in address is not allowed
email.@domain.com Trailing dot in address is not allowed
email..email@domain.com Multiple dots
あいうえお@domain.com Unicode char as address
email@domain.com (Joe Smith) Text followed email is not allowed
email@domain Missing top level domain (.com/.net/.org/etc)
email@-domain.com Leading dash in front of domain is invalid
email@domain.web .web is not a valid top level domain
email@111.222.333.44444 Invalid IP format
email@domain..com Multiple dot in the domain portion is invalid

 

 

Contributors

List of people who help contribute to help solidify the cases

gabriel.lozano-moran

bernie halpin

Avdhut