Stop Outbound SMTP Automatically on Mail Queue Size Alert

Is there a way I could automatically stop the outbound SMTP service when the threshold I set is exceeded? Although I’ve only been hit twice in the past year, I’d like to at least stop the service until I can intervene, inspect and rectify.

Thank you,
Chris

Hi chrisz

I do not believe this function exists as an option at the moment and I would think you might be better with throttle over a full stoppage.

I believe this is a feature request and also added in IW blog, so hopefully it might be added very soon.

I think there is a post in the forums detailing a short term solution but I would have to look it up sorry

Many thanks

John

[QUOTE=d2d4j;25014]Hi chrisz

I do not believe this function exists as an option at the moment and I would think you might be better with throttle over a full stoppage.

I believe this is a feature request and also added in IW blog, so hopefully it might be added very soon.

I think there is a post in the forums detailing a short term solution but I would have to look it up sorry

Many thanks

John[/QUOTE]

You’re right, John,

I think this was added in the ideas page. It should probably be added to the bug-tracker as well.

I’ll make sure it’s been added.

http://www.interworx.com/ideas/email-rate-limiting/

Sorry to bump a 7+ month old thread but I figured this can be of use to somebody else. I found a script online that sends alerts and monitors the qmail queue so I tweaked it so that it stops qmail if the queue reaches a certain level.

#!/bin/bashEMAIL="[email protected]"
LIMIT=###
QVALUE=`/var/qmail/bin/qmail-qstat | head -1 | awk '{print $4;}'`
WARNING="Your mail queue is over $LIMIT, please investigate."


if
 [ "$QVALUE" -ge "$LIMIT" ] ; then
 /etc/init.d/smtp stop
 echo $WARNING
 echo "Check the queue!" | mail -s "$WARNING" $EMAIL
fi

All you need to change is EMAIL and LIMIT to your values, you can also change the WARNING message if you want a more descriptive subject or want to include the hostname or something.

Hi Kujoe

Many thanks for sharing, but do you mind me asking, when you stop SMTP, is this only for outgoing SMTP. If not, stopping SMTP incoming will stop incoming email, which is not ideal.

I do like your idea of a warning to be sent, and also wondered if this is a cron script, as you have not said how to run its orry.

It might be an idea to run this along side spamdyke, which can limit teh number of recipients a user can sent to at any 1 go.

Once again, many thanks for sharing

John

The script stops the following services: smtp, smtp2, sendmail

I had it set to run every 5 minutes on a cron and I didn’t think about it but you’re right, this will stop both inbound and outbound SMTP so it’s not ideal. I came up with this idea before I started using an external SMTP server to filter inbound and outbound mail for spam which is a much better solution.

The code I posted above would work better if it just blocked ports via iptables instead. I’ll do an update when I get a chance.

Finally got around to fixing the code so it just blocks outbound e-mails from being sent over port 25:


#!/bin/bash
EMAIL="[email protected]"
LIMIT=###
QVALUE=`/var/qmail/bin/qmail-qstat | head -1 | awk '{print $4;}'`
WARNING="Your mail queue is over $LIMIT, please investigate."
if
 [ "$QVALUE" -ge "$LIMIT" ] ; then
 /sbin/iptables -A OUTPUT -p tcp --dport 25 -j DROP
 echo "Check the queue!" | mail -s "$WARNING" $EMAIL 
fi