I have same bug. All applications can not resolve some DNS names. only
'dig' with '+ignore' can resolve such DNS names:

$ dig vkontakte.ru
;; Truncated, retrying in TCP mode.
;; Connection to 10.10.10.2#53(10.10.10.2) for vkontakte.ru failed: connection 
refused.


$dig +ignore vkontakte.ru

; <<>> DiG 9.5.1-P2 <<>> +ignore vkontakte.ru
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52643
;; flags: qr tc rd ra; QUERY: 1, ANSWER: 22, AUTHORITY: 7, ADDITIONAL: 0

;; QUESTION SECTION:
;vkontakte.ru.                  IN      A

;; ANSWER SECTION:
vkontakte.ru.           353     IN      A       93.186.225.6
vkontakte.ru.           353     IN      A       93.186.225.211
vkontakte.ru.           353     IN      A       93.186.225.212
vkontakte.ru.           353     IN      A       93.186.226.4
vkontakte.ru.           353     IN      A       93.186.226.5
vkontakte.ru.           353     IN      A       93.186.226.129
vkontakte.ru.           353     IN      A       93.186.226.130
vkontakte.ru.           353     IN      A       93.186.227.123
vkontakte.ru.           353     IN      A       93.186.227.124
vkontakte.ru.           353     IN      A       93.186.227.125
vkontakte.ru.           353     IN      A       93.186.227.126
vkontakte.ru.           353     IN      A       93.186.227.129
vkontakte.ru.           353     IN      A       93.186.227.130
vkontakte.ru.           353     IN      A       93.186.228.129
vkontakte.ru.           353     IN      A       93.186.229.2
vkontakte.ru.           353     IN      A       93.186.229.3
vkontakte.ru.           353     IN      A       93.186.224.233
vkontakte.ru.           353     IN      A       93.186.224.234
vkontakte.ru.           353     IN      A       93.186.224.235
vkontakte.ru.           353     IN      A       93.186.224.236
vkontakte.ru.           353     IN      A       93.186.224.238
vkontakte.ru.           353     IN      A       93.186.224.239

;; AUTHORITY SECTION:
.                       294316  IN      NS      G.ROOT-SERVERS.NET.
.                       294316  IN      NS      H.ROOT-SERVERS.NET.
.                       294316  IN      NS      I.ROOT-SERVERS.NET.
.                       294316  IN      NS      J.ROOT-SERVERS.NET.
.                       294316  IN      NS      K.ROOT-SERVERS.NET.
.                       294316  IN      NS      L.ROOT-SERVERS.NET.
.                       294316  IN      NS      M.ROOT-SERVERS.NET.

;; Query time: 4 msec
;; SERVER: 10.10.10.2#53(10.10.10.2)
;; WHEN: Thu Oct 22 16:12:33 2009
;; MSG SIZE  rcvd: 503

mrl...@mrlika-desktop:~$
mrl...@mrlika-desktop:~$
mrl...@mrlika-desktop:~$
mrl...@mrlika-desktop:~$
mrl...@mrlika-desktop:~$ dig vkontakte.ru
;; Truncated, retrying in TCP mode.
;; Connection to 10.10.10.2#53(10.10.10.2) for vkontakte.ru failed: connection 
refused.
^cmrl...@mrlika-desktop:~$ dig +ignore vkontakte.ru

; <<>> DiG 9.5.1-P2 <<>> +ignore vkontakte.ru
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 241
;; flags: qr tc rd ra; QUERY: 1, ANSWER: 22, AUTHORITY: 7, ADDITIONAL: 0

;; QUESTION SECTION:
;vkontakte.ru.                  IN      A

;; ANSWER SECTION:
vkontakte.ru.           151     IN      A       93.186.225.6
vkontakte.ru.           151     IN      A       93.186.225.211
vkontakte.ru.           151     IN      A       93.186.225.212
vkontakte.ru.           151     IN      A       93.186.226.4
vkontakte.ru.           151     IN      A       93.186.226.5
vkontakte.ru.           151     IN      A       93.186.226.129
vkontakte.ru.           151     IN      A       93.186.226.130
vkontakte.ru.           151     IN      A       93.186.227.123
vkontakte.ru.           151     IN      A       93.186.227.124
vkontakte.ru.           151     IN      A       93.186.227.125
vkontakte.ru.           151     IN      A       93.186.227.126
vkontakte.ru.           151     IN      A       93.186.227.129
vkontakte.ru.           151     IN      A       93.186.227.130
vkontakte.ru.           151     IN      A       93.186.228.129
vkontakte.ru.           151     IN      A       93.186.229.2
vkontakte.ru.           151     IN      A       93.186.229.3
vkontakte.ru.           151     IN      A       93.186.224.233
vkontakte.ru.           151     IN      A       93.186.224.234
vkontakte.ru.           151     IN      A       93.186.224.235
vkontakte.ru.           151     IN      A       93.186.224.236
vkontakte.ru.           151     IN      A       93.186.224.238
vkontakte.ru.           151     IN      A       93.186.224.239

;; AUTHORITY SECTION:
.                       294114  IN      NS      A.ROOT-SERVERS.NET.
.                       294114  IN      NS      B.ROOT-SERVERS.NET.
.                       294114  IN      NS      C.ROOT-SERVERS.NET.
.                       294114  IN      NS      D.ROOT-SERVERS.NET.
.                       294114  IN      NS      E.ROOT-SERVERS.NET.
.                       294114  IN      NS      F.ROOT-SERVERS.NET.
.                       294114  IN      NS      G.ROOT-SERVERS.NET.

;; Query time: 4 msec
;; SERVER: 10.10.10.2#53(10.10.10.2)
;; WHEN: Thu Oct 22 16:15:55 2009
;; MSG SIZE  rcvd: 503

-- 
DNS lookup fails if there are too many records records (e.g. 
smtp.googlemail.com)
https://bugs.launchpad.net/bugs/327364
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