Hi, first post to this list but long term Linux user here.
I have Postfix configured for virtual domains and delivery to cyrus-imap
via LMTP over IP. All is working well besides one detail.
It seems that when senders request a DSN they do not get any response.
I've tested this from an external Exchange system and I can see my test
message arriving in the logfiles but no trace of an outgoing DSN.
The system has Postfix v 3.5.8 operating on Rocky 8.7 (RHEL clone)
If I'm reading the manuals correctly the virtual_delivery_status_filter
and lmtp_delivery_status_filter settings should be the same default as
smtp_delivery_status_filter.
Could someone more enlightened shine some light of what I may be missing.
Many thanks
Ken
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