2014-02-14 05:17:14 UTC
When I checked the description of "reject_unknown_recipient_domain" on
official portal: http://www.postfix.org/postconf.5.html, I found the
description is ambiguous with the implementation.
Below is the quote from portal:
*reject_unknown_recipient_domain*Reject the request when Postfix is not
final destination for the recipient domain, and the RCPT TO domain has 1) *no
DNS A or MX record* or 2) .......
From the description, If one domain has no DNS A record or no DNS MXrecord, it will be reject as unknown recipient domain, however, the
It will check MX record first:
a) if exist, treat as known domain directly;
b) if not exist, check if A record exists;
So truth is that only reject if *no MX record and no A record*. Just my 2