Hi Bozicek,
On mine, All messages from PDW that make it to my ISP SMTP server are delivered within 30 seconds-2 minutes depending on internet traffic, mail server hops and mail server queues etc. The only ones that don't make it are the ones that timeout getting to the first mail server (see earlier post on this!).
My guess would be it's not a PDW problem, because if PDW doesn't send the message successfully (presumably within a finite time, a few minutes perhaps?) it gives up (which is happening to me).
Cheers
...Steve