Bruce Marshall wrote:
On Saturday 24 July 2004 03:53 pm, James Knott wrote:
Bruce Marshall wrote:
On Saturday 24 July 2004 03:15 pm, James Knott wrote:
I've set up a mail server, using SuSe Standard Server, and while it's now working, it appears I've also got an open mail relay running. According to what I've read in the O'Reilly Postfix book, postfix is supposed to default to not be an open relay. I've check main.cf and I can't see anything that might be causing the open relay. Any ideas, as to what I might check? I've shut down postfix, until I can resolve this problem.
Why are you allowing people outside your firewall (you do have one don't you?) to come in on port 25?? If they can't use port 25, they can't use you as a relay.
How would incoming mail get to the server, if port 25 isn't open? There is a firewall ahead of the server, with port 25 forwarded to the server.
You didn't mention you were running your own incoming mail server. Are you?
Most people bring in mail using pop3 or such with fetchmail. If you're running your own mx, then you should (IMHO) know how to set postfix to not be a relay. (I don't know since I don't run my own incoming smtp)
I'm trying to set up a mail server for a small company. According to the O'Reilly Postfix book, it is already configured to not relay, but it apparently is relaying. At the moment, I'm just going by what the status displays show, as the server is about 25 miles away and only physically accessable during business hours. I plan to go in and verify what's happening, with ethereal.