Hi,
I have seen the project details and I can offer you much more than your expectation.
Well this seems to be a simple config issue. Just discuss it hopefully you will get this fix for Free :)
Although I am relative new on freelancer however I have an extensive experience and Rapport on other microjob sites. I am experienced with 10+ years of Server management including Mail Exchanges, SMTP relays on both Windows and Non Windows based system like Linux, Unix, Solari, JVm etc.
Regards