Sending Email to @tmomail.net

Hello,

I use Gmail and I’ve tried to use [my cell number] @tmomail.net to have emails forwarded to my cell phone as a text message. However, never getting Google’s confirmation text message that is to be sent to [my cell number] @tmomail.net it seems this is being blocked for some reason. Can you please help me so that I can get the confirmation and set up message forwarding to [cell number] @tmomail.net