I have been trying all solutions related to SMTP issues posted in this forum. I changed the password, removed the TPG email account from outlook and retried to add it. None is working and I still can not send messages. I use this email address for my business and it is frustrating that it is not working. I will take lots of efforts to redirect all business emails. I appreciate if there is a specific solution that I might not be aware of.
@Syedissa . Try ticking the authentication box.
Error messages usually come with an error code.
I recently received an ip address which required me to do the same after about 7 years of not having it set.
If still no good, you could try reboot of the router.