Hmmm... another test ...
/etc/mailman/mm_cfg.py
added (at least for now): # Set this Yes to activate VERP probe for disabling by bounce # VERP_PROBES = No VERP_PASSWORD_REMINDERS = Yes VERP_PERSONALIZED_DELIVERIES = Yes VERP_DELIVERY_INTERVAL = 1 VERP_CONFIRMATIONS = Yes