There's new user joined company and I invited him as what I did before. However, this time the new user hasn't received anything. I tried to resend in user management tab for several times, and he carefully checked all the mail boxes, there's no invitation mail.
It worked well days ago. And I don't think it's due to company mail server as we're using same company mail server and others can receive invitation mail before.
Any possible way to figure out what goes wrong?