Mapped network drives are specific to the user account that created them

Question regarding SMTPQ:

On the new server I mapped a network drive that was connected to the NAS box that holds the queue:

s:\  =  \\xyz\smtpq\

When I set the folders in smtpQ Manager as follows the service will not start

Queue Directory:    s:\queue
Undelivered Directory:    s:\undelivered

However if I use the network paths as follows:

Queue Directory: \\xyz\smtpq\queue
Undelivered Directory: \\xyz\smtpq\undelivered

The SMTPQ service starts.  Why does using the mapped drive letter fail?

Answer:

Using the mapped drive letter fails because the Windows Service account does not have the mapping.  The drive letter mapping is specific to your interactive user account.