Splitting a multiple recipient message into individual messages

Ken A ka at pacific.net
Thu Jul 6 16:23:37 IST 2006

Jim Holland wrote:
> Hi
> On Sat, 27 May 2006, Stephen Swaney wrote:
>> I finally found a few minutes so this has been added to the Wiki:
>> http://wiki.mailscanner.info/doku.php?id=maq:index#sendmail_8.13_anti-spam_/
>> _denial_of_service_protection_features 
>> I've also added:
>> "How Split a Multiple Recipient Message in Single Messages" under:
>> http://wiki.mailscanner.info/doku.php?id=maq:index#misc._questions 
>> I've added the sendmail instructions. If anyone wants to add the Exim method
>> to split messages to multiple recipients into individual messages please
>> feel free :)
> Thanks for these notes.  I see the comment that this may increase the load 
> significantly on the server as it will have to process more messages.  I 
> would also imagine that it would have a significant impact on bandwidth as 
> well, as each recipient's copy of a message would be delivered separately.  
> That is of much more significance for ourselves than the CPU load as we 
> are handling traffic for 2500 people on a 64k leased line.  On the other 
> hand we handle large mailing lists that could involve sending outgoing 
> mail to over 2000 people, and these lists would collapse if we were to 
> send each message individually.  What we need therefore is a way of 
> splitting incoming messages (where the bandwidth issue would not arise 
> but where we need to be able to apply rulesets individually) but not 
> outgoing (where we need to conserve bandwidth and where rulesets generally 
> don't apply).  Do you know how to modify the sendmail local ruleset 
> accordingly?
> Regards
> Jim Holland
> System Administrator
> MANGO - Zimbabwe's non-profit e-mail service

You should be able to do this with sendmail's queue groups functionality 
using the access.db by creating another queue group in your incoming 
instance of sendmail that _doesn't_ split incoming mail. See 

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