>Knute Johnson wrote: > >> I'm running a FC5 box and using sendmail for my mail server. A >> couple of days ago I noticed some mail not leaving and reporting >> deferred because of No route to host. I tried to telnet to these >> mail servers and get the same no route to host error. So it seems >> that they are in fact not reachable. The odd thing is that they >> should be busy mail sites. One of them is my own ISP's mail server. >> Any >> idea where to start looking for the problem? > >Can you reach any external mail sites? If not the problem might be your >ISP or firewall has blocked any traffic from port 25. > >If you can, figure out if the problem belongs to port 25 or is >reachability in general. Can you ping the external IP? Use traceroute >to the external site to see how far you can get with UDP if anywhere. >If that's fine, try telnet to port 80 on the same IP. > >One other thing, the box at whatever.com might not handle the mail sent >to somewhere@xxxxxxxxxxxxx Use > >$ dig whatever.com mx > >and look for the line with MX in to find out where mail does go for that >domain and telnet to that box. > >-Andy It is only mail servers I can't get to. I think my ISP has blocked outbound port 25 again, this happened once before. He's trying to keep the spammers under control and probably forgot that I've got the mail server running. I live in a rural area and he is a one man band so things do get messed up once in a while. Thanks, -- Knute Johnson Molon Labe...
