> On Jul 26, 2017, at 8:36 AM, Matus UHLAR - fantomas <uh...@fantomas.sk> wrote:
>
> I have read the DSN README, and I'm searching if there's a better
> alternative than disabling DSNs at all.
My advice is to disable DSN at the edge of each administrative
domain. Remote senders that request SUCCESS notifications from
their sending MTA will be notified of success when your edge
MTA accepts their mail. What happens after that is your problem
not theirs.
Conversely, when sending mail, I generally also suppress any "DSN"
advertised by other systems, and return SUCCESS to any of my users
once mail becomes the responsibility of the remote domain.
Thus on "inbound" edge servers I have:
smtpd_discard_ehlo_keywords = dsn,silent-discard
And on "outbound" edge servers I have:
smtp_discard_ehlo_keywords = dsn,silent-discard
--
Viktor.
