Email: postfix-exercise3.txt

ENABLING MAILDIR, CONFIGURING IMAP AND POP
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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 sanog user:

        (DO THIS AS THE SANOG USER!)

        $ mkdir /home/sanog/Maildir
        
        Note: if you do not do this as the sanog 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" sanog@YOURDOMAIN.ws3...

        * 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 ~sanog/Maildir/

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

        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. Configure the "courier IMAP" daemon

        * Add the following lines to the end of your /etc/rc.conf file:

        courier_authdaemond_enable="YES"
        courier_imap_imapd_enable="YES"
        courier_imap_pop3d_enable="YES"

        * Now start it:

        # /usr/local/etc/rc.d/courier-authdaemond start
        # /usr/local/etc/rc.d/courier-imap-imapd start
        # /usr/local/etc/rc.d/courier-imap-pop3d start

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/sanog/.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://sanog@wsXX                      (where wsXX is your own machine)
        Password for sanog@wsXX: 

        IMAP:

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

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

        $ mutt -f pop://sanog@wsYY                      (where wsYY is another machine in the room)
        or
        $ mutt -f imap://sanog@wsYY                     (where wsYY 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 ?