[Dovecot] Hundreds of auth-worker sockets in /etc/dovecot

I run dovecot 1.2.6, before last update I had 1.2.2. on Debian Lenny. I noticed that my config directory /etc/dovecot is filled up with hundreds of old auth-worker.12345 sockets. I guess they should have been cleaned up, is there a misconfiguration? When I remember right, this did not happen with dovecot 1.1.