Thanks everyone for your help on this. We got an updated nlm from Novell that responds to IPv6 type=aaaa queries and since then the mail is being processed normally.
I am still not happy about the time and energy that went into having to diagnose a problem with someone else's antispam software. Especially given that there own authoritative dns does not resolve the same queries that they are bouncing mail on. Rather hypocritical if not plain stupid. Todd ----- Original Message ----- From: "R. Scott Perry" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, July 08, 2003 6:42 AM Subject: Re: [IMail Forum] Still getting bounced mail > > > The dns query that is being sent is an IPv6 type=aaaa. Meaning they > >want to know the IPv6 IP address of the domain of the sender. Our dns is > >not setup to resolve IPv6 queries so it sends NXDOMAIN, or > >NonExistantDomain. And the message get bounced by their antispam software > >saying "Domain does not exist" > > > > I am still not sure if IPv4 query is being sent. Or if we are wrong(Non > >RFC Compliant) by not being capable of resolving IPv6 type=aaaa queries. > > Technically, the NXDOMAIN response (from an authoritative nameserver) > indicates that the domain in question does not exist. So if they query for > the AAAA record for example.com, and an authoritative nameserver for > example.com returns NXDOMAIN, it's saying "the example.com domain does not > exist." > > So lookups for the AAAA record (or A record) for > "nonexistenthost.example.com" should return NXDOMAIN, but lookups for the > AAAA record (or A record) for "www.example.com" should NOT return NXDOMAIN > (unless you don't have a www.example.com). > > It sounds like a new anti-spam program is doing this, as we've recently had > requests for http://www.DNSreport.com to check for this. > > -Scott > --- > Declude JunkMail: The advanced anti-spam solution for IMail mailservers. > Declude Virus: Catches known viruses and is the leader in mailserver > vulnerability detection. > Find out what you have been missing: Ask for a free 30-day evaluation. > > --- > [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
