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Most PMDF channels depend upon a slave, or server, channel program to receive incoming messages. For some transports supported by PMDF, in particular TCP/IP and UUCP, you need to make sure that the transport activates the PMDF slave program rather than its standard server. Replacing the native sendmail SMTP server with the PMDF SMTP server is normally performed as a post-installation task when first installing PMDF; see the appropriate edition of the PMDF Installation Guide for instructions.
For the multithreaded SMTP server, the startup of the SMTP server is controlled via the PMDF Dispatcher. The PMDF Dispatcher controls the starting up of an SMTP server or servers, according to your Dispatcher configuration. If the Dispatcher is configured to use a MIN_PROCS value greater than or equal to one for the SMTP service, then there should always be at least one SMTP server process running (and potentially more, according to the MAX_PROCS value for the SMTP service). The pmdf process
command can be used to check for the presence of SMTP server processes;
see Section 34.2.4. Also, the Dispatcher statistics web page can be
viewed to check just what connections SMTP processes are currently
handling.
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