>There was an issue in which Hotmail (and MSN) DNS query responses had the
>truncation bit set (a long DNS response) causing the MX connect failed
>messages. This was fixed in 7.04.
ah, ok, hotmail.com for one, is very close to the 512 DNS UDP packet limit:
# dig hotmail.com mx
; <<>> DiG 8.3 <<>> hotmail.com mx
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 14, AUTHORITY: 4, ADDITIONAL: 7
;; QUERY SECTION:
;; hotmail.com, type = MX, class = IN
;; ANSWER SECTION:
hotmail.com. 1H IN MX 5 mx05.hotmail.com.
hotmail.com. 1H IN MX 5 mx06.hotmail.com.
hotmail.com. 1H IN MX 5 mx07.hotmail.com.
hotmail.com. 1H IN MX 5 mx08.hotmail.com.
hotmail.com. 1H IN MX 5 mx09.hotmail.com.
hotmail.com. 1H IN MX 5 mx10.hotmail.com.
hotmail.com. 1H IN MX 5 mx11.hotmail.com.
hotmail.com. 1H IN MX 5 mx12.hotmail.com.
hotmail.com. 1H IN MX 5 mx13.hotmail.com.
hotmail.com. 1H IN MX 5 mx14.hotmail.com.
hotmail.com. 1H IN MX 5 mx15.hotmail.com.
hotmail.com. 1H IN MX 5 mx01.hotmail.com.
hotmail.com. 1H IN MX 5 mx02.hotmail.com.
hotmail.com. 1H IN MX 5 mx04.hotmail.com.
;; AUTHORITY SECTION:
hotmail.com. 1H IN NS ns1.hotmail.com.
hotmail.com. 1H IN NS ns2.hotmail.com.
hotmail.com. 1H IN NS ns3.hotmail.com.
hotmail.com. 1H IN NS ns4.hotmail.com.
;; ADDITIONAL SECTION:
mx05.hotmail.com. 1H IN A 64.4.56.199
mx06.hotmail.com. 1H IN A 64.4.55.7
mx07.hotmail.com. 1H IN A 64.4.42.7
mx08.hotmail.com. 1H IN A 64.4.49.7
mx09.hotmail.com. 1H IN A 64.4.49.71
mx10.hotmail.com. 1H IN A 64.4.49.135
mx11.hotmail.com. 1H IN A 64.4.49.199
;; Total query time: 155 msec
;; FROM: lc2.sprocketdata.com to SERVER: default -- 66.100.167.3
;; WHEN: Fri Feb 8 12:54:54 2002
;; MSG SIZE sent: 29 rcvd: 507
!!!
Len
http://MenAndMice.com/DNS-training
http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K
http://IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways
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