JP> I see that I too have Sendmail with Warp 4--but can find no trace of 
 JP> documentation for it, either hard copy on on line.

 JP> Where can I find out what this beast is and how it works?  

You'll be cheered up to know that a whole industry has grown around trying to
help people to use sendmail.  There are "pocket guide" books in bookshops, web 
sites, user groups, and consultants for hire.

UCB sendmail is one of the most complex to configure applications that exist.  
It has been said that the contents of its configuration file most closely
resemble modem line noise.  Like Microsoft DOS-Windows is the most widely used 
PC operating system, UCB sendmail is the most widely used SMTP server.  Like
Microsoft DOS-Windows, the complexity of UCB sendmail's configuration has
caused the growth of a market segment that simply wouldn't exist otherwise. 
And like Microsoft DOS-Windows there are much better alternatives to UCB
sendmail available that those in the know use instead, such as qmail, postfix, 
mmdf, and zmailer (alas, none of which have been ported to OS/2 -- but there
are other native OS/2 SMTP servers).

Here's a *very* simplified overview:

        To send a message (must already be in RFC822 format):

                sendmail -bm < message_file.txt

        To run the daemon that listens on the SMTP port for incoming messages:

                sendmail -bd

        To perform one pass over the queue of messages pending delivery:

                sendmail -q

        To run as a daemon making regular passes over the queue every 30
minutes:

                sendmail -q30m

        To combine the SMTP and queue daemons into one:

                sendmail -bd -q1h

For more information on the command-line syntax, go to "Reference and
Commands" in the OS/2 Warp 4 "Information" folder, open the _TCP/IP Command
Reference_ on-line book, and read the "sendmail Client" and "sendmail Server"
sections.

 ¯ JdeBP ®

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