How to send mail if port 25 is blocked [on hold]

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http://serverfault.com – I am trying to send mail from a server where port 25 is blocked. Is there any free way to send mail. Here is the relevant PHP code $subject = "Hello, ".$username; $message = $username.", you have just become a member of mysite.com. Your password is ".$password; $from = "[email protected]"; $headers = "From:" . $from; mail($email,$subject,$message,$headers); The message is accepted for delivery, accoring to my mail log, but it does not show up in my email. Again, I just want to send mail automatically without paying for it. (HowTos)