using ahref tag in $msg variable

I would like to know how to code my mail msg to accept an <a href> tag my current code is: $msg = "$username wants you to check out \"The AdVentures of AdWoman: AdWoman's Dilemma.\"\n\n"; $msg .= "Play for a chance to win a Caribbean cruise presented by Carnival Cruise Line and <a href='http://www.contus.com'>Contus.com</a>.\n\n"; $msg .= "This adgame is presented by the American Advertising Federation, which cordially invites you to attend the <a href='http://www.aaf.org'> AdVentures Conference</a>, the AAF's National Convention in Miami, Florida June 5-8. $msg .= "This adgame was created by AdGames.biz.\n\n"; $mailheaders = "From: webmaster@adgames.biz\n"; $mailheaders .= "Reply-To: webmaster@adgames.biz\n\n"; mail("$friendemail1", "$username Referred you an Adgame!", $msg, $mailheaders); My auto response email is printed with the < a href=....code instead of creating the hyperlink for me. Any suggestions on how to create this type of hyper link in a non html email? Thanks