[dns-operations] DNSSEC and qmail

Patrik Wallstrom pawal at blipp.com
Thu Oct 8 11:34:12 UTC 2009

On Oct 8, 2009, at 11:54 AM, Tony Finch wrote:

> We've just had a report of qmail being unable to deliver mail to our  
> site.
> The cam.ac.uk zone has been signed for a few months, and it seems that
> some of our DNS responses blow out qmail's 512 byte response buffer.  
> Its
> error messsage is "CNAME lookup failed temporarily" but in fact qmail
> actually performs an T_ANY lookup which produces a 1.3KB reply (DO=0).

This is a very common error for qmail - and has been for a very long  
time. I thought it was well documented. (The answer for MX at  
yahoo.com is 586 bytes!)  The first time I encountered this was in  
2001, and my standing recommendation is not to use qmail at all.

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