[Mailman-Developers] SLOW Mailmans delivery

[Kory Wheatley]

Is there a way to slow down the delivery of Mailman to the subscribers 
of all my Mailing lists? We have one list that has 16,000 subscribers to 
one domain, all these accounts are on our mail server. Every time a 
message is sent out from this list, it really causes the load on our 
mail server to be high. Currently our Mail server is on a powerful 3 
processor HPUX 11 NClass server with 2GB of RAM.  Mailman 2.1.1 is on a 
Red Hat 8 Pentium 600mhz, using Postfix as the MTA.

I have Postfix setup to do slow delivery to this domain (isu.edu), but 
that doesn't seem to help. I also lowered the   SMTP_MAX_RCPTS =  to 3, 
thinking that might help.

Postfix is setup as:
In Main.cf
transport_maps = hash:/etc/postfix/transport
slow_destination_concurrency_limit = 1

In Master.cf
slow    unix    -       -       y       -       -       smtp

In Transport
isu.edu           slow:


Any Suggestions like causing  the  smtp process to pause after sending 
out a boat load of messages and then resume again.

Kory Wheatley