Thank you for your post and welcome to the forums.
Looks like you're trying to use our Email -to -TXT service I'd recommend sending to firstname.lastname@example.org this Email to Text service (SMTP) is more convenient and a widely used method to sending messages as an SMS from an email address to any Rogers mobile phone. So you'll be able to send from an email program like Yahoo, Gmail, Hotmail, etc. Please keep in mind any charges using Email -to -TXT depends on the plan and works pretty much the same way as if the messages were sent from a mobile device. I also noticed you had mms listed in the address you were trying to use, if you're trying to sned images the @sms.rogers.com dose not support images.