Hi @Jscire ,
Welcome to the community!
We're sad to know that you're having issue sending an email. We'd like to confirm if your iPhone is connected to TPG's network or if you're using Mobile Data using a different ISP.
In the event that you're Mobile Data from other ISP, we recommend to use the outgoing server dedicated for the ISP. Also, please check if the issue still persist using your Post Office https://www.tpg.com.au/home/postoffice
Let us know how it will go.
Thanks for the confirmation. We'll have this investigated, you may also raise it directly to our Postmaster for faster response, you can reach them firstname.lastname@example.org. PM us your account details (Username/Customer ID together with the address on file).
In case you need a reference: How do I private message (PM) in the community