I run a big website witch sends a lot of mail (by php). I get the error "unrouteable mail domain (host)" a lot, it seems that only 40% arrives.
I`ve asked my host about this, but they react very slow and don`t really seem te care.. I`ve searched google for hours but didnt really find something, only some tweak settings, but its not my server so I cant use them.
So i signed up at this forum, my last hope do you have any idea how I can fix this problem?
Problems occur with every host, im certain that i include the correct headers.
Im a linux newbie but do know a lot about php
Thanks in advance