The multithreaded SMTP client sorts outgoing messages to different
destinations to different threads. The
may be used to instruct PMDF's multithreaded SMTP client to handle only
the specified number of messages in any one thread, using additional
threads even for messages all to the same destination (hence normally
all handled in one thread).
threaddepth may be of particular interest for
achieving multithreading on a
daemon router TCP/IP
channel---a TCP/IP channel that connects to a single specific SMTP
server -- when the SMTP server to which the channel connects can handle
multiple simultaneous connections.