For the last couple of weeks we've been having problems with our office's email server. We're using a linux Red Hat 5 server with Webmin installed. The configuration is pretty much the default one, we hadn't had any problems before.
Some weeks ago we noticed that every time someone using a @hotmail.com account tried sending us emails, they'd bounce back. The message that returned was something like this:
With the following attachment:
Arrival-Date: Tue, 3 Jul 2007 11:02:34 -0700
Diagnostic-Code: smtp;554 Transaction Failed (650058837:169:-2147467259)
First we thought it was perhaps that one of Hotmail's IP addresses was being blocked for spam, which we confirmed later on. Obviously, we couldn't leave it just like that, we even removed the FEATURE line that contained from which blacklist site should the webserver get the spam addresses. Now we're getting spam like crazy, yet we can't receive emails from Hotmail
Our webserver's behind a Fortigate 200a firewall, but it doesn't have the check for spam feature enabled ( or any other of the sort )
I don't really know what other things we could change to make it work, we can receive from any other provider except from Hotmail.
The error message it gives doesn't give me much, tried googling for it, but nothing relevant appears.
Do you know anything else that we could do to make it work?