I've found what was the problem: in my SendGrid account there was Link Branding enabled. But that's little bit strange because it was enabled before moving to the new server and it worked fine.
i proxied my nodeBB instance through apache but after someone logs in they get routed to the my main page instead to the nodeBB subdomain.
If I enter the subdomain?loggedin manually the route is correct.
Someone know the problem and a soluton to it?
MfG Tobias Teske
@Tobias-Teske What url is set in your config.json file?
will check that!
@rod thanks that did it. i entered the wrong url there