Stop inbound

Julian Field MailScanner at
Thu Apr 21 17:16:33 IST 2005

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Scott Silva wrote:

>AP wrote:
>>Hey Guys,
>>Is there a way that I can shutdown the reception of mail to the inbound
>>queue while still allowing MailScanner to process what's currently in the
>>inbound queue and still allow the delivery of mail in the post-processing
>>I know that I could turn off port 25 on the Firewall to the specific mail
>>gateway but I would like to do this on the Mail Gateway itself.
>>Here's my reason.  We sometimes early in the mornings (3-4am) get directed
>>SPAM attacks that loads up our primary mail gateway.  Our inbound queues
>>can get quite large and the primary mail gateway will continue receiving
>>the mail without regard to how large the inbound queue is getting.  We can
>>sometimes get 3000-5000 messages in the inbound queue while our secondary
>>mail gateway is practically idle.
>>I was thinking that I could write a mailqin monitoring script that would
>>poll the queue every 5 minutes and if it has reached some kind of
>>threshold, say 500-1000 messages, it would then stop the receiving of
>>inbound mail until MailScanner had processed the queue down to some
>>minimum, say 100 messages, before it would start back the receiving of
>>mail.  That way the secondary mail gateway would start taking on some of
>>the load and we could avoid some of the message delays that we get because
>>of the backlog.
>>Our primary and secondary mail gateways are fairly heavy duty boxes, Server
>>class with dual hyper-threaded processors and lots of memory so it is not
>>that the boxes are underpowered it's just that the secondary box is being
>>under utilized.
>>Any thoughts or suggestions would be welcome.  If there is a better way to
>>handle this I would be interested to know.
>If you are running on a RedHat or equivalent you could just run;
>service MailScanner stop
>service MailScanner startout
That will not start MailScanner, only the MTA.

>or run the equivalent on the init script with full paths.
>And then service MailScanner startin
No, do a "service MailScanner restart" so you get MailScanner itself
running again.

>when you want incoming again.
>Maybe a better idea would be to try some type of blacklist at the MTA
>level like sbl+xbl if it won't kill too much legit mail. That list alone
>kills 80% of my spam in the US.

Julian Field
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