smail not resolving some remote addresses

[matt@debian.debian.org]

I'm having trouble sending mail from my hamm machine to some remote addresses.  many addresses, for example 'debian-user@lists.debian.org', receive my mail, but some mail is bounced immediately.  Following is a mail I receive immediately after trying to send to my email account at my ISP:

--- beginning of message

>From MAILER-DAEMON Thu Nov 26 10:36:34 1998
Return-Path: <MAILER-DAEMON>
Received: from debian by debian
        via smail with bsmtp
        id <m0zj4PC-000EOPC@debian> (Debian Smail3.2.0.101)
        for <matt>; Thu, 26 Nov 1998 10:36:34 -0600 (EST)
Message-Id: <m0zj4PC-000EOPC@debian>
Date: Thu, 26 Nov 1998 10:36:34 -0600 (EST)
From: <MAILER-DAEMON@debian>
To: matt
Subject: mail failed, returning to sender
Reference: <m0zj4P9-000EOMC@debian>
Status: RO

|------------------------- Failed addresses follow: ---------------------|
 mmiller@netnet.net ... transport inet_zone_bind_smtp: 553 <matt@debian>... unresolvable; rejected. Check your DNS
|------------------------- Message text follows: ------------------------|
Received: by debian
        via send-mail from stdin
        id <m0zj4P9-000EOMC@debian> (Debian Smail3.2.0.101)
        for <unknown>; Thu, 26 Nov 1998 10:36:31 -0600 (EST)
Message-Id: <m0zj4P9-000EOMC@debian>
Date: Thu, 26 Nov 1998 10:36:31 -0600 (EST)
From: matt
To: mmiller@netnet.net
Subject: test

[body not included]

--- end of message

I'm gettin a ppp connection to my provider, and this works fine for most email and for web surfing.  In the above example the remote domain is 'netnet.net' (my ISP), and I am able to surf to their homepage, 'netnet.net'.

I am using the smail 3.2.0.101-4, binary distribution.  I am not using a 'routers' file.  Following is the start of my 'config' file:

--- beginning of /etc/smail/config excerpt

visible_name=debian
more_hostnames=localhost
-domains
hostnames=debian

max_load_ave=5
smtp_accept_max=20
smtp_accept_queue=10
rfc1413_query_timeout=15

-require_configs
-second_config_file
-qualify_file
-retry_file
copying_file=/usr/doc/smail/copyright
max_message_size=10M

--- end of etc/smail/config excerpt

Thanks for any ideas

Matt Miller

===============================================================================
'Hardcopy: a death certificate for data'

	-Mark Gancarz, 'The Unix Philosophy'
===============================================================================