Hi,
I'd like to add that yesterday I got a complaint from a customer
that went on about a 40 second smtp session. I also noticed my
concurrency had gone up to 66 from a normal 25. I found that I couldn't
lookup the following black lists:
sbl.spamhaus.org
relays.ordb.org
relays.mail-abuse.org
I still cannot resolve these hosts and as soon as I removed them and
added cbl.abuseat.org the qmail smtp session took less than one second.
-----Original Message-----
From: 24x7server [mailto:[EMAIL PROTECTED]
Sent: Thursday, February 15, 2007 11:40 PM
To: [email protected]
Subject: Re: [qmailtoaster] SLOW SMTP SESSION - FAQ
Hi all
based on what we have discussed, here are the checks to be made incase
of a slow smtp session faced by emails users located on server sending
out emails using outlook express or similar email client
in a real life practical example
assuming that your server has a ping response of less than 350 ms and
with a 64 kilobits per second (8 kilobytes connection) a one liner test
email shud go in less than 5 seconds assuming that your server is having
normal load of around 2-3.
follow the checks below
1) start with blacklists
remove all rbl lookups in your /var/qmail/control/blacklists file
if your smtp session improves then one of the rbls is the problem
causer. preferred that you keep only -r bl.spamcop.net. adding others
causes a lot or realife problems especially if you are hosting many
domains and have many email users.
2) server dns check
check resolv.conf
a) ips shud be as such
nameserver 127.0.0.1
nameserver aaa.aaa.aaa.aaa
nameserver bbb.bbb.bbb.bbb
the 2nd and 3rd lines are the dns servers of your datacenter / isp
b) make sure that you have your local dns cache is working and
forwarders are set correctly
d) try interchanging the sequence of ips
nameserver aaa.aaa.aaa.aaa
nameserver bbb.bbb.bbb.bbb
nameserver 127.0.0.1
if this speeds up the mailing then your local dns is at fault.
if the above checks fail then please post your question to the list
our request that other list participants add their comments to this for
others to see.
rajesh m
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