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    <p>Yes, there are things that could block locally hosted mail. For one, your ISP could block SMTP to servers other than the ISP. ask your ISP support if they block SMTP... Or try telexing so someone's MX port 25 and do you get a response?</p> <p>If your ISP blocks smtp you can still send the mail, but first you must relay that email through a hosted email server like your ISP mail server. This process is called 'smart hosting' and you can search for more info. </p> <p>Even if you are not blocked on port 25, many sites will refuse or lose smtp traffic that originates from a dynamic or residential IP address, so again the smart host suggestion.</p> <p>Also I suggest not using the built in mail() function in PHP... Use something that replaces and improves it like <a href="http://pear.php.net/package/Mail" rel="nofollow">http://pear.php.net/package/Mail</a> or <a href="http://sourceforge.net/projects/phpmailer/" rel="nofollow">http://sourceforge.net/projects/phpmailer/</a>. Again, use the SMTP method as it is way more reliable than direct sending or calling Sendmail.</p> <p>It is important to confirm this problem, doing SMTP manually over telnet. That way you isolate the problem from PHP. I did ISP support for years and saw this question lots. Most people setup php and mail correctly but get stuck on a background network issue with SMTP.</p> <p>If you have Wireshark installed, it can record network traffic and you might see the actual SMTP traffic, for example the remote server may be refusing your connection. Wireshark is helpful but not required to solve this though. Good luck.</p>
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