Ken Smith:
> 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.
You need to configure the Postfix LMTP client that it is doing final
delivery (LMTP does not assume that every delivery is final, they
could be to a content filter instead).
Either in master.cf:
lmtp unix .. .. .. .. .. lmtpd flags=DORX
Or in main.cf (obsolescent feature):
lmtp_assume_final = yes
Do "postfix reload" after changing the configuration.
Don't mess with delivery status filters.
Wietse
> 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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