[Exim] Dig finds MX rec, but Exim gives "TRY_AGAIN"

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Author: Keith Goettert
Date:  
CC: exim-users
Old-Topics: [Exim] exiscan works with nai viruscan?
Subject: [Exim] Dig finds MX rec, but Exim gives "TRY_AGAIN"
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At my wits end on this one. I have a debian 3.0 box running 4.20 kernel
and exim 4.20. I have configured the system for a plain jane delivery
of hosts on a 192. net to outside hosts. Any delivery at all (even form
a client on the box) fails to do the DNS lookup.

If I run exim in debug here is an example of the output:

|12303 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
12303 routing keith@???
12303 --------> dnslookup router <--------
12303 local_part=keith domain=alistmail.net
12303 checking domains
12303 alistmail.net in "@ : bad.com : good.com : new.com"? no (end of list)
12303 alistmail.net in "! +local_domains"? yes (end of list)
12303 calling dnslookup router
12303 dnslookup router called for keith@???
12303 domain = alistmail.net
12303 DNS lookup of alistmail.net (MX) gave TRY_AGAIN
12303 alistmail.net in dns_again_means_nonexist? no (option unset)
12303 returning DNS_AGAIN
12303 dnslookup router: defer for keith@???
12303 message: host lookup did not complete
12303 added retry item for R:alistmail.net: errno=-1 0 flags=0
12303 post-process keith@??? (1)
12303 LOG: MAIN
12303 == keith@??? R=dnslookup defer (-1): host lookup did
not complete
12303 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

|
yet if I kill exim and run dig at the same command prompt (ie. same
environment) I get:

|# dig alistmail.net MX
|
|; <<>> DiG 9.2.1 <<>> alistmail.net MX
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 34290
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1

;; QUESTION SECTION:
;alistmail.net.                 IN      MX


;; ANSWER SECTION:
alistmail.net.          604800  IN      MX      0 wilson.alistmail.net.


;; AUTHORITY SECTION:
alistmail.net.          604800  IN      NS      birch.HelpfulHome.net.


;; ADDITIONAL SECTION:
wilson.alistmail.net.   604800  IN      A       168.103.92.138


;; Query time: 91 msec
;; SERVER: 207.224.115.73#53(ns1.helpfulhome.com)
;; WHEN: Sat Jul 19 11:29:29 2003
;; MSG SIZE rcvd: 102

|The dig lookup completes immediately (less than half a second) as does
nslookup. Also, ping immediately looks up the address and is able to
ping the mail host.
|
|This is just an example domain, all domains fail even popular
destinations like yahoo. I am sure that this is a short circuit in my
DNS resolver, but it only seems to affect exim. This was originally a
3.x exim install from the debian dists. I yanked it when it did exactly
the same thing. I just thought it would be easier for the group to help
me with the problem on a current version...||
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