Lars Liedtke:
> Hello,
>
> I am having trouble using reject_unknown_sender_domain. I boiled the
> whole restrictions down to
>
> smtpd_recipient_restrictions = warn_if_reject reject_unknown_sender_domain
>
> and still a mail do an invalid domain is not rejected or I am not warned
> about rejection:
reject_unknown_sender_domain will consider the domain as "existing"
- if a DNS query of type MX, A, or AAAA (if compiled with IPv6
support) produces a resource record,
- or the above query produces a response and you have configured
an smtpd_dns_reply_filter that removed those resource records.
Wietse
