Hi,
I added yesterday the option to reject unknown hosts to smtpd in main.cf:

smtpd_recipient_restrictions =
        permit_mynetworks,
        reject_unknown_client,
        reject_unauth_destination,
        check_recipient_access regexp:/etc/postfix/recipient_checks.regexp,
        permit

And I got these kind of messages from a mailing list I'm suscribed to:

Feb 6 08:32:23 bugs postfix/smtpd[19366]: [ID 197553 mail.info] reject: RCPT
from unknown[170.210.248.6]: 450 Client host rejected: cannot find your
hostname,
[170.210.248.6]; from=<proposicion-admingrulic.org.ar>
to=<martinbugs.unl.edu.ar>

But an nslookup to 170.210.248.6 gives me the correct answer:

rootbugs:/ # nslookup 170.210.248.6
Server: ultra1.unl.edu.ar
Address: 168.96.132.2

Name: river.unc.edu.ar
Address: 170.210.248.6

rootbugs:/ #

Any ideas on what could be wrong?

I'm on Postfix-1.1.2.

Saludos... :-)

-- 
Porqué usar una base de datos relacional cualquiera,
si podés usar PostgreSQL?
-----------------------------------------------------------------
Martín Marqués                  |        mmarquesunl.edu.ar
Programador, Administrador, DBA |       Centro de Telematica
                       Universidad Nacional
                            del Litoral
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