One more detail, your printer has to be sending the scan from a valid e-mail address or otherwise it will be refused by Rogers' servers.
This "FROM" address should be a real address and it must be configured in your yahoo e-mail settings.
1. Go to http://rogers.mail.yahoo.com and sign in
2. Click on the "gear" icon in the top bar and click settings
3. Select accounts
4. Click add
5. Add any address that you will use to send e-mails from
A verification e-mail will be sent out to these addresses to confirm that you are authorized to send from them.