From: Anthony Howe
Date: 2008-03-15 07:55:12 -0400
Subject: Re: [SPAM] milter-spiff returning DNS UDP response truncated,
More information..: http://www.milter.info/#Support
Michael Grant uttered...:
> Milter: to=<email@example.com>, reject=451 4.4.3 sender
> <firstname.lastname@example.org> via 220.127.116.11 SPF result TempError: DNS
> UDP response truncated, TCP support not implemented
> Second, I don't know why this domain is returning a truncate bit on
> this dns query. If I do it by hand with dig, it works fine.
Did you follow the chain of nested include: entries?
> My understanding of DNS is that the udp query could truncate if the
> response is greater than 512 octets. Is milter-spiff building a dns
> query that's sometimes returning data greater than this limit?
No. It is not in the building of the query, it is in the response(s)
I've already written a new asynchronous DNS client API, Posted Domain
Query (pdq), which does handle TCP based queries and multihomed MX and
PTR records much much better. At some point I have to port all the
milters that use my older Dns API to use pdq: milter-spiff,
milter-sender, and milter-link come to mind. Part of the delay is I want
to debug pdq more before I use it all my code, but really the best way
to test it is just get it out there. Maybe milter-spiff would be a good
place to start.
Anthony C Howe Twitter: SirWumpus SnertSoft
+33 6 11 89 73 78 Skype: SirWumpus BarricadeMX & Milters
http://www.snert.com/ ICQ: 7116561
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