Starting a new topic in this as responses to a similar thing in another topic seem to have petered out.
I have Discourse running with mail-receiver. For outbound mail I have Postifx using port 587 for submissions. Mail-receiver listens for inbound mail on port 25. All works fine, except bounces do not get back to Discourse. I have the regex set for mail replies in Discourse for VERP according to recommendations.
How to debug and diagnose this? Sorry if this is a bit vague at this stage.
Does anybody else have this problem?