From owner-freebsd-isp  Mon Aug 13 11:12: 9 2001
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From: "A. David Perez Marfil" <dperez@unimayab.edu.mx>
To: isp@FreeBSD.ORG
Subject: sendmail relay by domain sender address
Date: Mon, 13 Aug 2001 13:11:53 -0500
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Hi, 
i have a FreeBSD 4.3 with Sendmail 8.11.3/8.11.3
in the mailer table i have  this line
.unimayab.edu.mx        smtp:[172.21.14.24]
the server is use to protect of spam the server 172.21.14.24 that is an
Exchange 5.5(MS)
the firewall and NAT that only let in smtp for 172.21.14.5 (FreeBSD).
Every works just fine but with some domain i got this problem.

Aug 13 08:21:09 dns sendmail[12926]: f7DDL8p12926: ruleset=check_mail, 
arg1=<jcastill@reduno.com.mx>, relay=reduno.reduno.com.mx [192.100.183.178],
reject=451 4.1.8 
<jcastill@reduno.com.mx>... Domain of sender address jcastill@reduno.com.mx 
does not resolve

but if i do a nslookup...

> set type=mx
> reduno.com.mx
Server:  dns.unimayab.edu.mx
Address:  172.21.14.5

Non-authoritative answer:
reduno.com.mx   preference = 30, mail exchanger = dns.reduno.com.mx
reduno.com.mx   preference = 10, mail exchanger = reduno.reduno.com.mx
reduno.com.mx   preference = 40, mail exchanger = dns.tij.reduno.com.mx

Authoritative answers can be found from:
dns.reduno.com.mx       internet address = 200.4.144.117
reduno.reduno.com.mx    internet address = 192.100.183.178
dns.tij.reduno.com.mx   internet address = 200.4.145.50

and the problem is the same with other domains.
what could be the problem?
Thanks in advance.
David Perez

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