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I'm one of the users that is having the problem Michele is describing. If I'm NOT on the local subnet, I can log in and get my mail fine, view the website, ssh, etc. However, when I'm on the local subnet, none of these services are available to me and about five or six other people.
That seems to be the kicker. I could understand if it was all local users, it would probably be a misconfiguration of Shorewall on that machine. Disabling Shorewall temporarily on a reboot caused us all kinds of other problems; we really don't want to attempt to do that again to test.
I can't really see it as being a permissions problem, as it is also affecting anonymous services such as httpd.
Any suggestions on where/what to look for would be appreciated.
This really does seem odd. I'm still not sure which pop3 server you are using - there may be a way to set restrictions in it's configuration - if you can find out the name and version I can help check the docs for it.
From what you have said (correct me if I'm wrong):
1) We can discount internal IP addresses being blocked - for instance User1 can access e-mail from internal PC1 and internal PC2 but User2 cannot access e-mail from either internal PC1 or internal PC2.
2) We can also discount user specific problems since User1 can access e-mail from everywhere and User2 can still access mail but not on the LAN.