Mailman memory usage after dist-upgrade

[Daniel Galambos <dancsa@dancsa.hu>]

Hi,

I recently upgraded a maillist server from Squeeze to Wheezy. We had no
problem with it until the upgrade.

In 1-2 weeks mailman's OutgoingRunner and BounceRunner processes eat all
the memories and a lot of swap.
The box has 1,5GB RAM and 2G swap.

Mailman version is: 1:2.1.15-1
There are 2 lists with around 40k addresses with one letter at week, the
other lists are small.

Why are the qrunner processes eat all the memory, and what can I do
against it?
I don't believe that the solution is to write a cron job to restart
periodically.

thanks,

Dancsa