Blocked port 25?

Thu Aug 19 03:37:03 UTC 2004

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In the last couple of days, I have received complaints from customers 
not able to receive email from certain sites.   From these sites, I 
can't connect to our mail server, on other sites, I can.  We have tried 
sending email, and we have also tried telnet on port 25 to the server.  
I can't seem to find a correlation.  There is no firewall on our 
network.  We have an access list to filter port 25, but this server is 
allowed.  Our mail server is also our DNS server.  From the sites that 
I can't connect to our server on port 25, I can query the DNS server 
using nslookup and get a response.

I tried tcptraceroute from one of the sites where I have a unix 
account, but it is behind a firewall, and it dies after the first hop.  
I'm stumped.  Any suggestions.

Byron L. Hicks
Network Engineer
NMSU ICT
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