False email validity check fails.

[jcagpir]

I checked 'jca@gm.com' (username and domain do not exist) with 'check_deliverability=True' and no error occurs.

[JoshData]

I think that's a real domain name (a major car manufacturer) so I would not expect the library to give an error. Are you expecting an error?

[jcagpir]

Here are the results obtained online on several validation sites for"jca@gm.com":

https://verifalia.com/validate-email Invalid email address: "the mailbox for the email address does not exist."

https://captainverify.com/fr/mail-tester.html: "jca@gm.com est inconnue"

https://www.verifyemailaddress.org/fr/validation-d-email:
" Nous pensons que jca@gm.com n'est pas valide
La syntaxe d'adresse email est correcte
MX enregistrement trouvé: mx2.imr.gm.com (Priorité 10)
La connexion à mx2.imr.gm.com a fonctionné
MX enregistrement trouvé: mx1.imr.gm.com (Priorité 10)
Réponse du serveur: 550 #5.1.0 Address rejected."

https://www.mailverifier.io : "jca@gm.com : This email is INVALID — DO NOT SEND"

Thank you for your follow-up.

[JoshData]

Those sites seem to be purporting to check the username part of the address for deliverability. This library doesn't do that (please see the README for details).

[jcagpir]

Thank you for your answer.
Do you plan to introduce the check of the username part of the address for deliverability in your library in the future?

[JoshData]

As the README says, there is no reliable way to do it. So it is unlikely I would add it, and I'm not actively adding new features. But anything is possible!