Debug Mode error

i have searched through many off the 2800+ posts on errors and no one seems to have this problem...  Just set up our new forums not even three weeks ago, everything is fine. But, when you try to send a private message you get this line:

Could not connect to smtp host : 65 : No route to host

DEBUG MODE

Line : 111
File : smtp.php

the message still goes through but since peolple think it doesn't they spam a lot trying to get it to work. So if the message works why is there an error??

not a huge problem just kind of annoying so any help would be appreciated...!