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Server error: '550 5.7.1 Relaying denied. IP name possibly forged

Level 2

Hi there TPG Community,

I am having trouble sending emails in the last two-three days from my MS Outlook on my Laptop.


This error is the message I get:

Server error: '550 5.7.1 Relaying denied. IP name possibly forged


I have successfully logged into my TPG Mailbox and I can send email without problems.

Additionally, I can send and receive emails without problems from my iPhone.

I'm receiveing all my emails into my MS Outlook on my Laptop - it's only 'Sent' Mail that is the problem.


Is it simply a case of changing my Password on my TPG Mailbox account?

Will the Password reset fix the problem?


Before I do the Password change, grateful for any suggestions as to how to fix the problem, please?





Hi @Scrooge, kindly check if you have the correct mail server settings. You can refer to this link: 


We also recommend that you try to change the password. If the issue persists, please send us a private message with your TPG customer ID, username and complete address so we can pull up the account.


Please also include the email address you're having issue with.


To send a PM please refer to this link: How do I private message (PM) in the community