If you have installed vbulletin Nulled script, you may face this problem. Please try another Nulled script by another person. And the other way is some hostings' POP3 and SMTP servers do not work in subdomain. If you installed your forum in not main root folder,example not in " www " and your forum is in " /www/forum " , you may face this problem. In this case,please, consulte with your hosting provider and they will solve your problem. Have fun !
