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I have a few questions.

I am new to UNIX/Linux. At work I notice that our mail server uses sendmail. When I looked in the file I see that it is using PROCMAIL as the Local Delivery Agent.

  1. I looked for /etc/procmail to see its configuration file but I see none. Is that normal?
  2. And the main question I have is how does procmail know where to deliver the mail? We have users on two partitions after all!
  3. When users loggin to this server to get email how does the email client know where to go?

I am fuzzy on understanding how mail systems work and could use some help.

Last edited by rbatte1; 07-05-2017 at 08:02 AM.. Reason: Set up formatted numbered lists

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Test Your Knowledge in Computers #105
Difficulty: Easy
The programming interface, file abstraction, built-in networking and persistent background processing are all features and capabilities supported by a Unix or Linux OS.
True or False?

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SENSIBLE-MDA(8) 					      System Manager's Manual						   SENSIBLE-MDA(8)

sensible-mda - a generic local MDA router for Debian systems SYNOPSIS
sensible-mda from to detail client-addr DESCRIPTION
sensible-mda is used to simplify the installation and configuration of sendmail(8) , or other MTAs for use on Debian systems. With sensi- ble-mda, sendmail can support a plethora of MDAs (procmail, maildrop, deliver, etc.) without having pick any one of them as required. FUNCTION
sensible-mda is called by sendmail as a local mailer when the following exists in define(`LOCAL_MAILER_ARGS', `sensible-mda $g $u $h ${client_addr}')dnl sensible-mda will look for the following MDAs (in this order), and pass the mail on to the first SUID MDA found (Or first found MDA, if run w/euid=root): procmail(1), maildrop(1), deliver(8), mail.local(8) OPTIONS
Available command line options are the following: from The sender of this email (sendmail $g variable) to The recipient of this email (sendmail $u variable) detail The detail portion of the recipient userid (sendmail $h variable) - ie: client-addr TCP/IP address of the sender (sendmail ${client_addr} variable) Not used (for the nonce) FILES
/etc/mail/ sendmail m4 input to generate /etc/mail/ actual sendmail configuration file (treated as a binary file) SEE ALSO
sendmail(8), procmail(1), maildrop(1), deliver(8), mail.local(8) BUGS
None known so far. AUTHOR
Richard Nelson <> HISTORY
4th Berkeley Distribution October 21 1999 SENSIBLE-MDA(8)

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