The mailing list for listmasters using Sympa

[address@concealed]

I'm trying to set up Sympa with Postfix for several virtual domains.
wwsympa works fine, but I cannot get mail into Sympa.

The problem obviously is the mta config:

sympa@mydomain:      "| /home/sympa/bin/queue sympa@mydomain"
listmaster@mydomain: "| /home/sympa/bin/queue listmaster@mydomain"

doesn't seem to work with Postfix.

Any hints?

TIA, Marcel