Settings> then scroll down to email settings
Select the email account you are receiving the relaying message from
Scroll down to outgoing mail server then tap on the SMTP box
Tap the primary server
User name and password will be blank simply enter your user name you don't need the @blah.com, then your password hit done in the top right, this screen will close, exit settings, start sending emails
Hope that this has been of help to people. You can now send emails from that annoying account without having to be connected to wifi.
The creator of this guide has not included tools