Forwarding verification is not being sent to x@tmomail.net email

Forwarding verification is not being sent to x@tmomail.net email

Hi

I am trying to forward all my incoming mails to the address    my10digitphonenumber@tmomail.net   to receive them as SMS or MMS.
According Tmobile phone carrier it must work and I know my friends are using this service.

I set up the forwarding and interestingly I receive forwarded mails EVEN BEFORE I verify my forwarding but I did not receive Verification email yet.

I deleted Forwarding and set it up again but same story.

Thank you