Hi There,
We have been running Postfix successfully for months now. We sent an
email to two subscriber groups last night. We monitor the number of
emails we send per minute with the following report:
00:30 541 564 601 655 633 498 376 342
615 498
00:40 512 455 485 432 609 525 443 211
0 0
00:50 2 0 0 0 0 0 0 0
0 0
01:00 0 9 15 11 10 14 14 12
12 15
01:10 9 13 13 10 14 11 16 12
14 12
01:20 14 14 12 14 20 9 14 12
15 15
01:30 13 12 12 17 12 12 12 11
15 10
The first group started at 00:30 and sent about 500 emails per minute
for a total of 9,000 emails. This is what we expect as this work is
being done with four randmap transports with one IP and two processes
each. We are in the middle of a migration and have our send rate
intentionally slowed down until the migration to new IP addresses is
complete.
The second group started at 01:00. The send rate changed from 500
emails sent per minute to 15 emails per minute. We are still
delivering this email as I type this.
I reviewed the email logs and the vast majority of the email is
"status=sent" -- there are few errors and no greylisting from the
ISPs. This is what I would expect at this send rate -- clean
maillogs.
I contacted the Network Team of our new Colocation. They say they do
not throttle port 25 -- just turn it off if needed. I need to figure
out a way to tell if the slow down is with Postfix (which I doubt) or
if email delivery is being slowed by an external force of some kind --
not the ISPs. I am spending a good deal of time with tcpdump and
iptraf but am unsuccessful so far. Any ideas?
Thanks, Greg
www.RayStedman.org
