Good one, Patrick. I had forgotten about that. I believe this happens
when you change the name associated with an account using qmailadmin.
It's a bug in that application (I just now posted a report for that on
the qmailadmin list, so we'll see about getting it fixed).
Another, I believe more common reason for duplicate emails is an
overloaded server, more specifically one that's taking too long to scan
emails. When the scan time gets to be too long (typically a couple
minutes or so), the sending server will initate a timeout. When this
happens, the sending server re-queues the message for delivery at a
later time. However, QMT doesn't know that, and proceeds to deliver the
message. So a little later, the sending server tries again, and QMT
dutifully processes the email. The cycle will continue until QMT manages
to complete the scan process before the sending server times out, at
which point QMT tells the sending server that it has successfully
received the message.
So in this case, the cure is to do some tuning with QMT to help reduce
the load. The simplest and most effective way to do this is to use
spamdyke. Simply run the qtp-install-spamdyke scripts, restart qmail,
and you should be good to go. The stock configuration for spamdyke works
very well, but you might want to adjust it a little for your particular
situation.
I would also check to be sure that your clamav-toaster package is up to
date. There was a version (or 2) of clamav which would occasionally eat
the cpu, causing load levels to be excessively high. This could also
cause duplicate emails.
If you're already running spamdyke and your clamav-toaster package is
current, I'll be surprised. QMT can handle a boatload of email with a
surprisingly small amount of hardware. FWIW, my first QMT was on a
P-II/266 w/ 512M RAM. It didn't host a lot of accounts, but it kept up
w/out flinching, and that was before spamdyke came along.
--
-Eric 'shubes'
On 03/17/2011 05:12 AM, Patrick Ring wrote:
Many times this is due to something placing a second mail filter
statement in the .qmail file. You need to comment one of them out.
-----Original Message-----
From: nishant amin [mailto:igonish...@gmail.com]
Sent: Thursday, March 17, 2011 4:40 AM
To: qmailtoaster-list@qmailtoaster.com
Subject: [qmailtoaster] need some help
hi all
recently i have received some complains from users that they are
receiving double email in their web mail account.i dont know what
could cause this..could you point me in the right direction
your help is highly appreciated
regards
NIshant Amin
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(www.vickersconsulting.com)
Vickers Consulting Group offers Qmailtoaster support and installations.
If you need professional help with your setup, contact them today!
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