Try removing the port from the url.
And if you are using a domain name, set it to the www.example.com version, as in:
"url" : "http:www.example.com",
(Within the config.json file in nodebb.)
Low priority bug fix request. While testing my email settings all of my tests were being received with the subject line of
[NodeBB] and not
[My forum name].
I ended up chasing my tail for about 20 minutes trying to figure out where in the settings I can change the outgoing subject line. Then I finally setup a scenario that generated a "real" email and voila the email subject line did not say [NodeBB] but rather my board name.
This is a very low priority bug fix request but fixing this may help another new user from losing a bit of time looking for a setting that isn't relevant.
Thanks @Rod, I believe this is fixed in