I’m getting some latency with the
connect to our SMTP SENDMAIL server on Fedora Core 1 that I can’t
figure out.
User’s email hangs in the outbox
for 5-10 seconds before sending starts.
So I started telnet-ing (on port
25) to our Sendmail-8.12.11-1 server. (Upgrading to Sendmail
8.13 is not possible presently, nor is another SMTP handler.) Sure enough, it
took a good a good 5 seconds to send back the SMTP connect banner.
I got an instant banner telnet-ing
to pop3 on the same server.
The SMTP/POP3 server is in the DMZ and I’m testing
from our LAN. If the travel through the firewall is the issue, then why would
pop3 banner up instantly?
Our server is at mail.imarcengraver.com. Try it. Let me know
è telnet
mail.imarcengraver.com 25 – do you get latency?
From our LAN and through the same firewall, I can telnet
port 25 to an external host ‘mail1.thenoc.com’ and get an instant
banner.
Turning on AUTH (port 113) between DMZ and LAN made no
difference.
At the server console a telnet to 127.0.0.1 25 yields an
instant banner.
Later today, I’m going to start sniffing packets at
the mail server. Anybody have any ideas before I start down this road?
Thanks,
--Bill