strange pop protocol?

[Wesley Craig]

On 30 Apr 2009, at 03:08, Stefan Palme wrote:
> As far as I understood, a POP3 server must ALWAYS send a response
> (+OK or -ERR). But in my case the server does not response at all.
>
> Any hints why/how this can happen? I see this behaviour very
> often on the wire. Maybe it is worth mentioning that the client
> in this case is MS Exchange.

Is the pop server hung?  Perhaps the mailbox is corrupted, so message  
two is causing the pop server to hang, crash, whatever.

:wes