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Validate Local Address

The email address “jsmith123@example.org” is a valid e-mail address.

The email address “john.smith.mail@example.org” is not a valid e-mail address.

The email address “john.smith@example.org” is a valid e-mail address.

The email address “john.smith@example” is not a valid e-mail address.

The email address “jsmith123@mail.example.org” is a valid e-mail address.