XenForo SMTP Mail Server Not Working Properly

[CodyMoores]

When a suer signs up to my site, they are awaiting email confirmation. I get an internal error each time stating:

Zend_Mail_Transport_Exception: Unable to send mail. mail(): Failed to connect to mailserver at "localhost" port 587, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() - library\Zend\Mail\Transport\Sendmail.php:137
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I changed my php settings to allow for this. The port is open and passed through my firewall. SMTP is set...

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