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--- email:install_a_full_secure_mail_server [2020/07/25 16:26] – old revision restored (2016/11/28 16:40) 92.220.10.100
+++ email:install_a_full_secure_mail_server [2020/07/26 11:22] (current) – old revision restored (2016/11/28 17:09) 158.69.243.115
@@ Line 57: / Line 57: @@
   - **Exim4** – the SMTP daemon.
-  - **Courier** – communication extension for Exim4 to have IMAP and POP access to emails.
+  - **Courier** – communication extension for Exim4 to have IMAP and POP access to emails; or
+  - **Dovecot** - communication extension for Exim4 to have IMAP and POP access to emails.
   - **Swaks** – Swiss army knife for SMTP troubleshooting.
   - **SSL-cert packages** – for easy work with generating certificates in later parts of the tutorial.
@@ Line 69: / Line 70: @@
 <code bash>
 apt-get update
-apt-get install exim4-daemon-heavy courier-authdaemon courier-imap courier-imap-ssl courier-pop courier-pop-ssl swaks libnet-ssleay-perl ssl-cert
+apt-get install exim4-daemon-heavy swaks libnet-ssleay-perl ssl-cert
+</code>
+Decide on using Courier or Dovecot.  Recommendation is to use Dovecot.
+==== For Courier ====
+<code bash>
+apt-get install courier-authdaemon courier-imap courier-imap-ssl courier-pop courier-pop-ssl
 </code>
@@ Line 89: / Line 98: @@
 </WRAP>
+==== For Dovecot ====
+<code bash>
+apt-get install dovecot-imapd dovecot-pop3d
+</code>
+Edit the file /etc/dovecot/dovecot.conf and amend the following line in the file /etc/dovecot/dovecot.conf:
+<code>
+protocols = pop3 pop3s imap imaps
+</code>
+In addition, add the following line in the "protocol pop3" section in the /etc/dovecot/dovecot.conf:
+<code>
+pop3_uidl_format = %08Xu%08Xv
+</code>
+Configure Dovecot to use the maildir mailbox format.  Edit /etc/dovecot/dovecot.conf:
+<code>
+mail_location = maildir:~/Maildir
+</code>
+<WRAP info>
+**NOTE**:  Maildir mails are almost always stored in ~/Maildir/ directory, which contains cur/, new/ and tmp/ subdirectories.  In maildir each mail is stored in a separate file.
+</WRAP>
+or alternatively change to:
+<code>
+mail_location = maildir:/home/%u/Maildir
+</code>
+<WRAP note>
+If !include conf.d/*.conf is uncommented in /etc/dovecot/dovecot.conf, it is necessary to set mail_location in /etc/dovecot/conf.d/10-mail.conf or comment the line out.  10-mail.conf will override the mail_location in dovecot.conf. If you choose to set the mail_location in 10-mail.conf, you have to change it to:
+</WRAP>
+<code>
+mail_location = maildir:~/Maildir
+</code>
+For SSL add or amend the following to the /etc/dovecot/dovecot.conf file.
+<code>
+disable_plaintext_auth = no
+ssl = yes
+ssl_cert_file = </etc/ssl/certs/ssl-cert-snakeoil.pem
+ssl_key_file = </etc/ssl/private/ssl-cert-snakeoil.key
+</code>
+Uncomment following line in /etc/dovecot/dovecot.conf:
+<code>
+listen = *
+</code>
+However, this method may cause conflicts with other servers already listening on other ports. The alternative (and probably more desirable) method, then, is to enable the specific listening ports for the protocols that are intended to be used. For example, for IMAP/IMAPS and POP3/POP3S, add to the correct protocol imap and protocol pop3 sections:
+<code>
+protocol imap {
+     listen = *:143
+     ssl_listen = *:993
+     ...
+     }
+protocol pop3 {
+     listen = *:110
+     ssl_listen = *:995
+     ...
+     }
+</code>
+If you want to see the config Dovecot is currently using (including the mail_location), use
+<code bash>
+dovecot -n
+</code>
+Start dovecot:
+<code bash>
+/etc/init.d/dovecot start
+</code>
+See https://help.ubuntu.com/community/Dovecot
+==== Verify the setup ====
 Verification of the installation can be done by checking the running ports with a netstat command.  Ensure that all the pop3, imap, smtp, pop3s and imaps ports are present as required:
@@ Line 107: / Line 207: @@
 In this example, each user will have their email inside their own home directory under ~/Maildir.  To have this as a standard setting for new users, simply add this directory to the skeleton so that it is automatically created for new users like this:
+It's a good idea to pre-create the Maildir for future users:
+<code bash>
+sudo maildirmake.dovecot /etc/skel/Maildir
+sudo maildirmake.dovecot /etc/skel/Maildir/.Drafts
+sudo maildirmake.dovecot /etc/skel/Maildir/.Sent
+sudo maildirmake.dovecot /etc/skel/Maildir/.Trash
+sudo maildirmake.dovecot /etc/skel/Maildir/.Templates
+</code>
+Then, for an existing user:
 <code bash>
-maildirmake /etc/skel/Maildir
+sudo cp -r /etc/skel/Maildir /home/myuser/
+sudo chown -R myuser:usergroup /home/myuser/Maildir
+sudo chmod -R 700 /home/myuser/Maildir
 </code>
-For existing users, you have to do this manually (or have a script for this).  For example for the test user "demouser":
+or for the example test user "demouser":
 <code bash>
@@ Line 383: / Line 497: @@
 ===== Step 10: Configure courier for IMAP =====
-You want this because it is most useful for your smartphone access that is definitely supporting mainly IMAP.  Just follow these basic commands:
+Ensure that the email client is definitely supporting IMAP.  Just follow these basic commands:
 <code bash>
@@ Line 751: / Line 865: @@
 The next step is to check how well SPF/DKIM and other functions are filtering out incoming spam!
+===== References =====
+https://help.ubuntu.com/community/Dovecot
+http://wiki.dovecot.org/