Help Needed: My RHEL5 box suddenly stopped accepting e-mails

[Jacky Li]

Hi,

Since you don't have iptables off and your company doesn't have a 
firewall, my guess your ISP is doing the filtering.  Can we get a 
description/picture of your network?

< your computer> <---> ISP <---> to the outside?

Jacky

> Here's what I get from the remote side:
>
> PORT STATE SERVICE
> 22/tcp open ssh
> 25/tcp filtered smtp
>
> I don't know what filters are in place; is there any way to get more
> information
> about the filters?
>
>
>