Friend's mail rejected by server

audiodef · Posted: Tue Apr 23, 2013 1:48 pm Post subject: Friend's mail rejected by server

I run my own mail server. Recently, a friend of mine has had trouble sending me email. This is the only person who has this problem, so my first thought is "it's Verizon's fault". But I want to make sure it's not something in my server settings.

eccerr0r · Posted: Tue Apr 23, 2013 2:23 pm Post subject:

It looks like you have anti-spam on your server, and that rejected Verizon's mail when it found it on SORBS.

I think there are a couple of default anti-spam services installed with the default mail config but not positive; I knew I had a couple of anti-spam services on my sendmail on my mail server that I don't recall adding...
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audiodef · Posted: Tue Apr 23, 2013 2:59 pm Post subject:

I should have checked for that before posting. I have

John R. Graham · Posted: Tue Apr 23, 2013 3:27 pm Post subject:

Are you on a static IP? Or is it dynamic and you're using something like dyndns to host your domain? If it's dynamic, you might just want to force your gateway to get a new IP address.

If your IP is static, then there should be a process with sorbs.net to get your IP address removed. I've never had to do this, so I don't understand the process, but it should exist.

- John
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audiodef · Posted: Tue Apr 23, 2013 5:28 pm Post subject:

John R. Graham · Posted: Tue Apr 23, 2013 5:45 pm Post subject:

Right; that's what I meant. About your friend's IP address being different next month, the problem will in all likelihood be gone next month. Fix it now proactively or just wait or encourage him to take steps to get issued a new IP. Before I got an explicitly static IP, all I had to do to get a new one was to reboot the gateway (modem, router: whatever he's got).

- John
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eccerr0r · Posted: Tue Apr 23, 2013 8:00 pm Post subject:

Is your friend sending SMTP directly from their computer or a relay like most Windows users? (If they're using a POP, IMAP, or web server for mail, then they're using some other machine for SMTP.)

If a relay of some sort, the IP address likely won't change unless it just so happens to drop on another SMTP server on Verizon's side...

I heard most ISPs nowadays filter sending TCP port 25 outgoing, so likely a Verizon relay is being used, and that is tough to get Verizon to change its IP...
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Jaglover · Posted: Tue Apr 23, 2013 8:36 pm Post subject:

Friend has to complain to whoever runs the mail server, it's the duty of friends mail server admin to secure the service and have it removed from blacklist.
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krinn · Watchman Joined: 02 May 2003 Posts: 7470

audiodef · Posted: Tue Apr 23, 2013 9:43 pm Post subject:

Thanks for all the advice. All of that makes sense. I think the best thing to do is for me to look at my friend's computer when I get a chance and configure his outgoing mail to use something not blacklisted.
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