LinuxMail.cc via Postfix-users:
>
> Hello,
>
> In my main.cf I have this setting,
>
> smtpd_reject_unlisted_sender = yes
>
> which I know the reason for existing.
>
> But in master.cf I see this option,
>
> submission inet n - y - - smtpd
> -o smtpd_reject_unlisted_recipient=no
> ...
>
> why set smtpd_reject_unlisted_recipient=no here?
Because this is an MUA service. Unlike an MTA, an MUA usually cannot
send non-delivery notifications.
Wietse
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