checkmail

Golang package for email validation.

• Format (simple regexp, see: https://www.w3.org/TR/html5/forms.html#valid-e-mail-address and https://davidcel.is/posts/stop-validating-email-addresses-with-regex/)
• Valid domain
• Valid user: verify if the user and mailbox really exist

Usage

###1# Format

func main() {
	err := checkmail.ValidateFormat("ç$€§/az@gmail.com")
	if err != nil {
		fmt.Println(err)
	}
}

output: invalid format

###2# Domain

func main() {
	err := checkmail.ValidateHost("email@x-unkown-domain.com")
	if err != nil {
		fmt.Println(err)
	}
}

output: unresolvable host

###3# User

func main() {
	err := checkmail.ValidateHost("unknown-user-129083726@gmail.com")
	if smtpErr, ok := err.(checkmail.SmtpError); ok && err != nil {
		fmt.Printf("Code: %s, Msg: %s", smtpErr.Code(), smtpErr)
	}
}

output: Code: 550, Msg: 550 5.1.1 The email account that you tried to reach does not exist.

License

Checkmail is licensed under the MIT License.