How to fix server does not allow relaying iphone

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.