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This is an example of an email from the user's side:

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Free online SMTP Tools

Here is the free online tools for you to debug and figure out how to reach out to seek support.

https://smtpserver.com/smtptest

If you set up your SMTP setting in the link above, and it can send out email, and the same setting don’t work inside of UChat SMTP profile, then it’s a issue from UChat side.

You can provide the login details to UChat support, we will test and fix it from our side.

If you set up the SMTP credentials, and it still can’t send out email from that online tools, and then it’s the issue from the provider you are using or the wrong credentials. you will need to contact the provider you are using and get the correct login details.