Yahoo mail (qmail) pukes my DNS information

[Michael Kjorling]

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Looking up chaham.com in the gTLD servers gives me:

	chaham.com.             172800  IN      NS      NS4.GANDI.NET.
	chaham.com.             172800  IN      NS      NS.chaham.com.
	NS4.GANDI.NET.          172800  IN      A       213.228.57.5
	NS.chaham.com.          172800  IN      A       212.106.223.146

Further investigation reveals that ns4.gandi.net is answering
*unauthoratively* with a referral, and ns.chaham.com doesn't resolve
so I had to try the IP directly:

	[michael at varg michael]$ dig @ns.chaham.com. chaham.com. any
	dig: Couldn't find server 'ns.chaham.com.': Name or service not known
	[michael at varg michael]$ dig @212.106.223.146 chaham.com. any

	; <<>> DiG 9.1.2 <<>> @212.106.223.146 chaham.com. any
	;; global options:  printcmd
	;; Got answer:
	;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30654
	;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 1, ADDITIONAL: 2

	;; QUESTION SECTION:
	;chaham.com.                    IN      ANY

	;; ANSWER SECTION:
	chaham.com.             604800  IN      MX      10 mail.chaham.com.
	chaham.com.             604800  IN      NS      ns.chaham.com.
	chaham.com.             604800  IN      A       212.106.223.146
	chaham.com.             604800  IN      SOA     ns.chaham.com. contact.chaham.com. 1 604800 86400 2419200 604800

	;; AUTHORITY SECTION:
	chaham.com.             604800  IN      NS      ns.chaham.com.

	;; ADDITIONAL SECTION:
	mail.chaham.com.        604800  IN      A       212.106.223.146
	ns.chaham.com.          604800  IN      A       212.106.223.146

	;; Query time: 110 msec
	;; SERVER: 212.106.223.146#53(212.106.223.146)
	;; WHEN: Sat Jun 30 19:46:30 2001
	;; MSG SIZE  rcvd: 172

Since sendmail by default tries to deliver to the host's A record if
there is no explicit MX defined, it is possible that this is what you
are seeing. I don't know whether qmail does that or not, though.

In any case, you want to fix your delegations. And getting a secondary
DNS server off your network would probably not be a very bad idea
either.


Michael Kjörling


On Jun 30 2001 13:43 +0200, Chahine M. Hamila wrote:

> Hi all,
>
> I am maintaining the chaham.com domain.
>
> It looks like I have been losing mail coming from certain sources.
> I know for a fact (I did every possible check to make sure) it's not due
> to my MTA. I find out that qmail had some bugs when dealing with DNS,
> and the problem looks indeed like it's coming from there sources which
> use qmail as an MTA.
>
> When trying to send email from Yahoo mail which uses qmail for example,
> I'm getting these errors after 24 hours:
>
> <test at chaham.com>:
> Sorry, I couldn't find any host by that name. (#4.1.2)
>
> or
>
> <test at mail.chaham.com>:
> CNAME lookup failed temporarily. (#4.4.3)
>
> The qmail bug is known to be activated when the DNS info size is bigger
> than 512 bytes, which isn't the case for any kind of chaham.com query
> AFAIK.
>
> Can anyone of you there check the DNS, and especially MX info and tell
> me if I'm doing something wrong? Thank you in advance,
> Chahine

- -- 
Michael Kjörling - michael at kjorling.com - PGP: 8A70E33E
"We must be the change we wish to see" (Mahatma Gandhi)

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