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Simple mailing list with Exim4 in 1 minute

How to establish a dead-simple archiving mailing list with Exim4 in 5 short steps.

  1. Create a directory where Exim4 archives your mailing list:

    mkdir /var/exim4lists
chown Debian-exim:Debian-exim /var/exim4lists # Check uid and gid of your Exim4-process.

  2. Define delivery addresses for your mailing:

    cat >>/etc/aliases <<EOF
mylist: /var/exim4lists/mylist, bob, alice
EOF

  3. Write a simple filter file, which adds Reply-to: mylist@example.com -header:

    cat >/etc/exim4/filter <<EOF
# Exim filter

if first_delivery and $header_to: is "mylist@example.com" then
    if $header_Reply-to: is not "" then
        # Save the original Reply-to -address.
        headers add "X-Original-Reply-to: $header_Reply-to:"
    endif
    headers remove "Reply-to"
    headers add "Reply-to: mylist@example.com\n" # Reply to the list by default.
endif
EOF

  4. Tell Exim4 where the filter can be found and allow Exim4 to write to files by inserting the following lines into the main configuration settings in /etc/exim4/exim4.conf.template:

    system_filter = /etc/exim4/filter
SYSTEM_ALIASES_FILE_TRANSPORT = address_file

  5. Update the configuration of your running Exim4-process(es):

    invoke-rc.d exim4 restart

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