Anyway his issue wasn't with Qmail (if it had been internal lookups would have failed as well). It was before that while trying to do a DNS resolution. As OP indicated it turned out it was a rule in his PIX blocking it from external so it wasn't really a BIND issue either.
-----Original Message----- From: bind-users-bounces+jlightner=water....@lists.isc.org [mailto:bind-users-bounces+jlightner=water....@lists.isc.org] On Behalf Of Mark Andrews Sent: Saturday, March 20, 2010 9:29 PM To: Tony Finch Cc: bind-users@lists.isc.org Subject: Re: T_ANY In message <alpine.lsu.2.00.1003202112330.2...@hermes-2.csi.cam.ac.uk>, Tony Fi nch writes: > On Sat, 20 Mar 2010, Glenn English wrote: > > > > Just why qmail reports a T_ANY failure as a CNAME failure, I also don't > > know. > > This is a bug in qmail. It tries to canonicalize domains in the SMTP > envelope of outgoing messages. It originally did this by performing CNAME > queries on each domain, but this caused interop problems with BIND 4. No it didn't. BIND 4 always answered CNAME queries correctly if the zone content was correct. What happened was people didn't correct load errors and a ANY query worked around the fact that they didn't correct the loadtime errors. > The > CNAME query was changed to an ANY query, which is buggy in a number of > ways: ANY queries are much more likely to trigger qmail's undersized DNS > buffer bug; and ANY queries are supposed to be used for debugging not for > normal operations. > > The correct way to canonicalize a mail domain is to do an MX query (or > failing that A and AAAA queries) and if the domain is not canonical the > response will include the CNAME record. > > The reason for canonicalization was conformance with RFC 1123 section > 5.2.2. However when qmail was written this was not necessary for > interoperability and the requirement was removed in the DRUMS process > that yielded RFC 2821. > > So the way to actually fix the bug is to delete the canonicalization code. > > Tony. > -- > f.anthony.n.finch <d...@dotat.at> http://dotat.at/ > GERMAN BIGHT HUMBER: SOUTHWEST 5 TO 7. MODERATE OR ROUGH. SQUALLY SHOWERS. > MODERATE OR GOOD. > _______________________________________________ > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users Proud partner. Susan G. Komen for the Cure. Please consider our environment before printing this e-mail or attachments. ---------------------------------- CONFIDENTIALITY NOTICE: This e-mail may contain privileged or confidential information and is for the sole use of the intended recipient(s). If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you. ---------------------------------- _______________________________________________ bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
