I've noticed that at change of month when e-mail should be sent to all list members (the password reminder) my CPU usage increases dramatically.

Right now I can see that Python consumes 93.4% of the CPU time (checked in top). My mailman is v2.1.2 and the list (one and only) has about 180 members. A wild guess would be that about 5% of these are invalid addresses.

Anyone with a qualified guess?

Anders.