> However some users are complaining about when they reply an
> ok message, they got:
>
> The confirmation code you gave (0A5476)  does not correspond to any
> pending command....
>
> What might cause this problem? Is there a solution to it?
 
They waited too long to reply.  The Confirm-Delay parameter in the
list header controls the length of time allowed.  The default is
48 hours.
 
Replying more than once will do it too, but the first OK will be
honored.