I installed vBulletin on my Mountain Bike web site (same forum your using right now btw). There are many selfish snobs in the area that want to kick mountain bikes out of the woods they can have the woods all to themselves, and this is a very unethical, dirty, scum bag group of people. So anyway, back to the point, to join my forum you have to click a link in the email the forum sends you. To help prevent these ässes from harrassing my web site. Now I can't seem to find any email settings for vB or PHP. Now some people get thier email no problem. I get all of my emails too no problem, my mail server being the same machine as my web server btw. But lots of people's activation emails get returned to me, all with different errors, one got a 501, one a 553, I even got a 550 not found, for an email address that I am very sure is real, and working. Whats is being used to send emails? Is there a way I can make my forum relay my mail through my own SMTP server? Thats how I used to have UBB configured, to use SMTP instead of sendmail, and it worked great.