Support the + alias for non-gmail domains
Currently, the mailbox_validation comes back as false for emails with the + alias trick (firstname.lastname@example.org) even if the domain is hosted by G-Suite
Support tells me this is a gmail only feature but that's not true, it works at least for hotmail.com and outlook.com emails too.
Why can't you just check the MX records to verify if the MX domain is one that supports the + alias trick?
Joe Sak commented
sorry, I mean "mailbox_verification" in the email validation API