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07-12-2001, 08:46 AM
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#1 |
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Member (11 bit)
Join Date: Mar 1999
Posts: 1,801
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Anybody know a lot about e-mail progs?
My boss in his infinite wisdom decided it would be "cool" if we hosted our own e-mail. I put together a machine and after a bit of research was able to get Post.Office running. This works fine( except for the times when he has played with the system and crashed it ) but I suspect that our server is being used to relay spam. Unfortunately I don't know exactly what to look for in the logs generated by Post.Office to understand if that's the case. When first started the program generated a log of about 1 meg in a day, now it's up to 50+, needless to say it doesn't take long to clog the system at that rate. So...anybody here know a enough about this to lend a hand?
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07-12-2001, 03:20 PM
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#2 |
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SQL nutcase
Join Date: Sep 2000
Location: Belgium
Posts: 1,136
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Make sure that you block your smtp server for anything that does not come from your network. If you want to keep using your smtp server make sure that you have authentication enabled.
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07-12-2001, 06:34 PM
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#3 |
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Member (11 bit)
Join Date: Mar 1999
Posts: 1,801
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Hmmmm, wouldn't know how to do that. This program is on a PC running NT4, it is hooked to a DSL connection. Our ISP is TDS, I think my boss had them set the MX records to point to our ISP. I know that in his infinite wisdom my boss has us hosting e-mail for people outside of our LAN, so I would assume that means the door is "wide open" so to speak. I just want to know how to close it and how to tell if the systems being abused.
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07-13-2001, 04:17 AM
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#4 |
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SQL nutcase
Join Date: Sep 2000
Location: Belgium
Posts: 1,136
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Block ALL incoming ports on your router, including port 7 (echo port). Then your smtp server is inaccessible for outsiders
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07-13-2001, 08:28 AM
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#5 |
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Member (11 bit)
Join Date: Mar 1999
Posts: 1,801
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With certain ports blocked our own mail didn't work, I'll look to see exactly which ports are currently open.
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07-13-2001, 08:55 AM
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#6 |
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Member (9 bit)
Join Date: May 2000
Location: Lexington, Michigan
Posts: 353
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for e-mail you need port 25 (smtp) open and
port 110 (pop3) open. if you suspect you have an open relay you can have it tested at http://www.abuse.net/relay.html if you are relaying, closing ports wont fix the problem you need to secure your mail server with a configuration change.
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07-14-2001, 07:23 AM
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#7 |
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Member (11 bit)
Join Date: Mar 1999
Posts: 1,801
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And how would I go about doing that?
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07-14-2001, 09:18 AM
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#8 |
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Member (9 bit)
Join Date: May 2000
Location: Lexington, Michigan
Posts: 353
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the web site mentions that the program has anti-spam features,
so i would suggest: "READING THE MANUAL!" as the first option |
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07-14-2001, 06:16 PM
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#9 |
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Member (11 bit)
Join Date: Mar 1999
Posts: 1,801
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Have you ever seen the manual for Post.Office?? it's huge!, mind you this is not my brainstorm, I've just been temporarily saddled with it. I do not claim to have a vast knowledge of e-mail server programs, I'm just trying to get this one working with a minimum of time spent on my part as I don't get paid for certain portions of what I do( I know I need a new job).
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