This has nothing to do with the wifi router. 
I see the exact same issue when I use a USB mobile broadband modem instead.
(whops, I thought I had already mentioned that, I hadn't).


Also note (again) my steps to reproduce the issue:

 Steps to reproduce:
 
 Make sure you're not connected to network
 Open Thunderbird
 Connect to network.
 CHECK THAT THE NETWORK CONNECTION WORKS BY OPENING A WEB PAGE IN A BROWSER
 Go to Thunderbird and click "get mail"

So, between connecting to the network and having TB check mail, I check
that everything else works by surfing the web with a browser. No matter
how much time I wait, the FIRST time TB tries to fetch mail it
systematically fails, even if it is several minutes after connecting to
network; the SECOND time it succeeds.

Frankly, I wouldn't look for the cause of this outside TB.

By the way, my DNS is NOT defined as 192.168.1.1, it is 8.8.4.4
(Google's DNS).


Regarding the other issue, the NONSENSE is that:
1. when connection to the server fails for whatever reason, no matter whether 
it is because the host is unreachable or because the name can't be resolved, it 
must show a message telling you what the failure is (such as "couldn't resolve 
domain name", or whatever), not a message that tells you what was the last 
thing it did and which doesn't even tell you whether it was a success or 
failure! ("looked up xxxx", as in "I looked up the domain. Don't ask me whether 
I found it or not").  When you tell a program to do something it must end in 
either or two ways: (a) "I'm finished doing what you asked me: the result is 
xxxx", or (b) "I couldn't complete the task because something went wrong: the 
error was xxxxx".
2. Even if you are not connected to the internet at all, it still says "looked 
up gmail.com"!!!! That's complete nonsense.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to thunderbird in Ubuntu.
https://bugs.launchpad.net/bugs/584529

Title:
  Thunderbird complains there is no connection on resume from suspend,
  when there is a connection

Status in Mozilla Thunderbird Mail and News:
  Confirmed
Status in “thunderbird” package in Ubuntu:
  Triaged

Bug description:
  Binary package hint: thunderbird

  When I resume from suspend, network manager quickly re-establishes a
  WiFi internet connection.  With an active connection, I try to check
  my mail with Thunderbird, but it complains that it can't connect to
  the IMAP server.  This seems to happen after longer suspend periods
  because if I try to replicate the behaviour by quickly suspending and
  resuming (suspend of a few seconds), I get no warning.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: thunderbird 3.0.4+nobinonly-0ubuntu4
  ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-22-generic x86_64
  Architecture: amd64
  Date: Sun May 23 12:26:28 2010
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100412)
  ProcEnviron:
   LANG=en_GB.utf8
   SHELL=/bin/bash
  SourcePackage: thunderbird

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