"Minimum time between autoreplies" not working

I have Virtualmin Pro 3.50 on CentOS 5, Postfix mail server

I have set an autoreply for an alias. I have set "Minimum time between autoreplies" to 180 minutes. Yet the autoreply is sent in response to every message from the same address, regardless of the time between messages.

Is this feature broken in the current code? If not, how do I get the autoreply feature to work as it is supposed to do? I want a minimum time between replies to avoid a loop between autoresponders.

Status: 
Closed (fixed)