Errors when making a post

[TransAm]

Almost everytime some body on my forum makes a post we get this error after the newest update.

2: fsockopen(): php_network_getaddresses: gethostbyname failed
File: E:\www\y2kdragon\transam\forum\Sources\Subs-Post.php
Line: 556
The post does get posted we just get that error. Thanks for the help

[[Unknown]]

Check your SMTP settings.

-[Unknown]