Dumb Newbie

Jason Dixon jason at dixongroup.net
Sun Feb 8 16:09:01 UTC 2004


On Sun, 2004-02-08 at 11:03, Pedro Fernandes Macedo wrote:

> Do a ps aux |grep postfix ... If you see a process called master , then 
> it's running. Otherwise , do a tail -f /var/log/maillog and , with it 
> running , do a service postfix restart. You'll see on maillog all the 
> errors that are preventing you from running postfix..
> Also , you can do a cat /var/mail/username to see if a message sent to 
> an user called username really got through..

The simplest, most idiot-proof way to do this is have a tcpdump running
on your external interface, sniffing tcp port 25.  Have someone remotely
telnet to your server's port 25.  Look for a SYN packet.  If a) their
connection is immediately refused, or b) indefinitely times out, and c)
you see nothing on your end, chances are good your ISP is blocking
inbound SMTP.

If you DO see traffic, then have them attempt a SMTP handshake.  But
first things first, verify you have actual TCP traffic making the
transit.


-- 
Jason Dixon, RHCE
DixonGroup Consulting
http://www.dixongroup.net





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