@pitaj To be fair, I haven't set up SMTP servers on NodeBB in the past so I can't tell.
I upgraded from 1.15.2 to 1.15.5 today to see if it would solve the issue, but no luck.
I've also changed the forum URL a couple of days ago but all I edited was the config.json file and the reverse proxy on apache.
The problem is, not even my "test mail" button works on my forum. I have to go on the users tab, and from there send a password reset email. It looks like it's trying to make it hard for me to set it up in any way possible.
I've also had another issue, where when I invite the users on the email, the /register URL doesn't work so they get a page error.
I'm starting to think my install could be broken..
I set up the same email service on the default Mail program in Windows 10, and the configuration works perfectly. I just can't tell what could be wrong with the settings I'm using. Maybe something server side that I have to edit?
Also, I'll open an issue on GitHub for the registration bug.