Classes of service using advanced queuing techniques.

[Rose, Bobby]

Speaking of extended queue groups, has anyone created a sendmail ruleset
to allow queue groups to be based on IP address instead of the sender or
recipient? 

I'm using queue groups with MailScanner with the advice of another MS
user.  What I had to do was create a copy of the MailScanner.conf (etc),
check_mailscanner (bin) script and the MailScanner script (bin) with
different names and check_mailscanner script is modified to call the
copied MailScanner script in bin.  The second MailScanner.conf is
modified to look at a different queue level and uses a different pid
file name.  The end result is two separate MailScanner processes each
looking at different queues.  Sendmail handles the queuing using the
extended groups.  

For us, the end result is one queue is for virus & spam checking and the
other queue is just for virus checking.  This helped our performance a
lot because messages from the university's list server aren't being
checked for spam.  Before we'd have large backups when "all user" type
messages were sent out forcing us to stop spamassassin checking in MS
until the queues cleared. 

It would be nice if the queue groups could use IP addresses though.


-=B


-----Original Message-----
From: MailScanner mailing list [mailto:MAILSCANNER at JISCMAIL.AC.UK] On
Behalf Of Errol Neal
Sent: Wednesday, December 15, 2004 3:34 PM
To: MAILSCANNER at JISCMAIL.AC.UK
Subject: Classes of service using advanced queuing techniques.

Hi everyone. Been a long time since I posted to this list since I
switched jobs. Happy holidays and hope everyone is doing well.

I've been looking into implementing a hierarchy of service levels for
mail delivery using the queuing capabilities of Sendmail and the
multiple outbound queue groups found in the custom functions of
MailScanner. What I'd like to do on the inbound side is to drop mail in
one of several queues based upon the recipient domain and other stuff.
This capability is already available to me through the use of the
extended queue groups. So, to realize my ambitions, I'd like MailScanner
to do the following:

1. Pick up mail dropped in multiple queues/* 

Since the dx and qx files will be split into separate directories, I
need to know if MailScanner can handle this. The directory structure
will be something like this

                        /var/spool/mqueue
                                                /highpriority
	
/dx
	
/qx
                                                /lowpriority	
	
/dx
	
/qx

2. Drop processed mail into multiple outgoing queues. 

I'm already using the feature &MultipleQueueDir to drop spam into a slow
queue, however I want to prioritize outbound mail on the basis of it's
final destination as well. Now I've tried using the following in
CustomConfig.pm:

                        return '/var/spool/mqueue.outbound.fast'
if $messages->{fromdomain}, veryimportantclient.com;

However, that did not work (If you are laughing at me, please do not.. I
have very little programming ability). Now, when I say "it did not
work", I did not get an error and the queue was actually used, however
the messages that went into the queue were not those that I wanted to. 

Is what I want to do possible? Secondly, does how does MailScanner
determine which message to process first in a batch of say 100 messages?
Is it FIFO based upon the time stamp on the file, or does it honor the
message priority assigned to the queue file by sendmail?

Thanks in advance. 

Errol Neal              	

__________________________________________
Errol Uriel Neal Jr. 
Network Administrator
DFI International, Inc.
1717 Pennsylvania Ave NW, Suite 1300
Washington, DC  20006
Tel (202)452-6955
Fax (202)452-6910
Eneal at dfi-intl.com
www.dfi-intl.com

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