Quoting Todd Vierling (tv@duh.org):
> On Thu, 1 Apr 2004, Brian de Alwis wrote:
> : When I fetchmail, I have dozens of procmail processes spawned, and
> : under a big load of messages this will exhaust the process limits.
> 
> : I've tried to change the MaxQueueChildren and MaxRunnersPerQueue
> : settings in my .mc file (attached), but to no avail.  I'm sure I'm
> : missing something simple.
> 
> Make an explicit submission command for fetchmail:
>     /usr/sbin/sendmail -odd yourlocalaccount

Better (and equiv) is 
   /usr/sbin/sendmail -ODeliveryMode=deferred yourlocalaccount
It's just easier to read later without a manual.

You could also serialize them with "interactive" where it
won't come back until it's done (and forked the procmail,
but you reduce the sendmails spun off).  ("-ODeliveryMode=interactive")


> The -odd will only put the message in Sendmail's queue and return rapidly,
> leaving the messages to be processed during the next queue run.  If you
> don't have Sendmail running in the background, you will need to run the
> queue once manually afterwards with the command "sendmail -q" (as root).