On Wed, Mar 09, 2011 at 09:40:26PM +0000, Tim wrote:
> What happens is that Postfix receives the message from the sender, queues
> it, then immediately connects to *all* of the destination servers
> simultaneously and starts sending the message to them. This completely
> saturates the upstream Internet link, so each destination server sees a
> gradual trickle of data, and virtually all of them time-out while receiving
> data.
On a server with limited network capacity set a small process limit for
the "smtp unix ... smtp" delivery agent entry in master.cf.
http://www.postfix.org/master.5.html
--
Viktor.
