Ronald F. Guilmette:
> But this other fellow I've been taking to offered an unexpected observation:
> If a given Postfix installation was attempting to support, say, 1 million
> unique domain names (correponding to 1 million unique customers) and if
> just 11,000 of those were to all simultaneously attempt to send -outbound-
> emails to six (6) different destinations apiece, then... this other fellow
> asserted... all of the 65536 maximum available IPv4 port numbers would be
> exhausted, and then havoc would ensue.
As shipped, Postfix makes up to 100 parallel outbound connections,
200 if configured as an MX for remote domains. It also has limits
on the number and size of in-memory objects, and it stops accepting
new mail before the file system is full.
Postfix is in a different league than software that just runs the
system into the ground under load, and that requires a babysitter
to become unstuck.
Wietse
