Both google and outlook can drop your mails without delivering them to the recipient, but you can find the rejection error code in your MTA logs. Though it's tr

Both google and outlook can drop your mails without delivering them to the recipient, but you can find the rejection error code in your MTA logs. Though it's true that microsoft just rejects everybody and google might not reject you at all, at least outlook has a procedure of sorts these days. I do not see any form at postmaster.google.com that I'm allowed to access.