greetings,
(1) reject_unknown_helo_hostname:
Reject the request when the HELO or EHLO hostname has no DNS A or MX
record.
This seems reasonable.
(2) reject_unknown_client_hostname:
Reject the request when 1) the client IP address->name mapping fails, or
2) the name->address mapping fails, or 3) the name->address mapping does
not match the client IP address.
This seems too strict.
It requires the sender IP has a valid PTR, which has a correct A RR,
which must match sender IP back. Otherwise the sender IP will be
rejected by this clause.
I have tested that many German (I once lived there) mail providers such
as web.de, freenet, t-online, vodafone have this setting enabled. But
other big providers like yahoo/aol/gmail/outlook seem not.
Thanks.
Tom
_______________________________________________
Postfix-users mailing list -- postfix-users@postfix.org
To unsubscribe send an email to postfix-users-le...@postfix.org
