Agenda: postfix-exercise3.txt

ENABLING MAILDIR, CONFIGURING IMAP AND POP
------------------------------------------

1. Edit the file "main.cf" (using vi or ee)

        Add the following lines to main.cf:

        home_mailbox = Maildir/

2. Create a Maildir folder for the sysadm user:

        (DO THIS AS THE SANOG USER!)

        $ mkdir /home/sysadm/Maildir
        
        Note: if you do not do this as the sysadm user,
        the mail system will NOT be able to deliver mail.

3. Try sendmail mail again to your domain:

        $ echo "test with maildir" | mail -s "test maildir" sysadm@MYNAME.ws.nsrc.org

        * Now, run mutt again:

        $ mutt

        ... do you see your mail ?

        No, the reason is that now the mail is not stored in /var/mail,
        but in the "Maildir/" directory in your home dir.

        To access it, first quit mutt ('q'), then relaunch mutt like this:

        $ mutt -f ~sysadm/Maildir/

        ... this explicitly tells mutt to access the "Maildir" in the
        home (~) directory of the user "sysadm".

        Why Maildir ?  It's a better mail storage format when many mails
        need to be accessed quickly - one email / file on the disk.


        But what if you want to read your mail remotely ?

4. Install and configure the Courier IMAP daemon

        # apt-get install courier-imap

        When asked about the web-enabled configuration file, say NO

        It should now be started!

5. You may now use mutt to read your mail via POP, and IMAP

        * First, tell mutt NOT to attempt SSL negotiation:

        $ echo 'set ssl_starttls = no' > /home/sysadm/.muttrc

        (We have not configured an SSL certificate yet, therefore we need
        to disable this option for the time being)

        Now, run mutt:

        POP:

        $ mutt -f pop://sysadm@pcX                      (where pcX is your own machine)
        Password for sysadm@pcX: 

        IMAP:

        $ mutt -f imap://sysadm@pcX                     (where pcX is your own machine)
        Password for sysadm@pcX: 

        ... you can now read your mail remotely, and you can also read mail
        on other machines:

        $ mutt -f pop://sysadm@pcY                      (where pcY is another machine in the room)
        or
        $ mutt -f imap://sysadm@pcY                     (where pcY is another machine in the room)

6. Open another window (or terminal), and log in as 'root'.

        * Now, run tcpdump so you can see the contents of the traffic on
          the POP (110) and IMAP (143) ports:

        # tcpdump -X -s0 -n port 143 or port 110

        * Now ask someone else to read mail on YOUR server

        * What do you observe in the tcpdump window ?

7. Try to setup your mail program on your laptop (Outlook, Thunderbird, ...) to
   read mail on your newly installed POP/IMAP server!