Hi @scrac, welcome to the community!
I'm sorry to read that you've been having issues with your outgoing email for a while now. Are you currently getting any error message when you are trying to send emails?
This community link will guide you with the basic set-up of your mobile email client.
Thanks for sending us your details. We noticed that your concern is with the outgoing emails. We'd like to confirm if you're using Mobile Data or Internet at home for your mobile to use the email.
The smartphone unable to send an email due to outgoing mail server that is currently set, you may just need to be updated.
If the smart phone is connected with TPG internet you need to use 'mail.tpg.com.au' if not, you may need to ask the Internet Service Provider the outgoing mail server setting they are using.
You may also test your email directly to our post office: https://www.tpg.com.au/home/postoffice
Let us know how it will go.
The mobile unable to send an email due to the outgoing mail server used to the settings. The outgoing mail server of the mobile email client should be the same with your ISP.
i.e - if the smart phone is connected to TPG you should use 'mail.tpg.com.au' as an outgoing mail server.
Note: All ISP has unique email server.