Michael Wallner wrote:

> Well, so here comes /the oddity/
> 
> connecting from debian to windows/exchange ~0.5 seconds
> connecting from debian to debian/courier ~0.2 (assumed to be somewhere at 0.x 
> seconds)
> connecting from windows to debian/courier ~5 seconds
> connecting from windows to windows/exchange ~0.5 seconds
> 
> Half a second is what I'd expect and is acceptable, but
> 5 seconds seems to be more serious than an oddity...

Anytime I see something like this, I suspect that the server (in this
case, Courier IMAP) is attempting an ident lookup on the client, or is
attempting a reverse DNS lookup.  I suspect the latter is more likely.
For kicks, try temporarily adding an entry for your windows client to
the /etc/hosts file on the Debian/Courier server.  If that fixes the
problem then I would look for ways to disable reverse DNS lookups in
Courier.  Just a thought...

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