panel.domain.tld ????

[TGates]

changed main.cf

TLS should be going through encrypted but NOT
i'm using the sendmail option in sentora config is that correct or should it be smtp ?
if so how to set up ?

If you set it up properly even sendmail() will use TLS because it is still being routed through your server.

I am using SMTP in the config and I also use https://www.mailjet.com/ for my smtp relayer.