To install dovecot, run the following command in the command prompt:

sudo apt-get install dovecot-common dovecot-imapd dovecot-pop3d

To configure dovecot, you can edit the file /etc/dovecot/dovecot.conf. You can choose the protocol you use. It could be pop3, pop3s (pop3 secure), imap and imaps (imap secure). A description of these protocols is beyond the scope of this guide. For further information, refer to the wikipedia articles on POP3 and IMAP.

IMAPS and POP3S are more secure that the simple IMAP and POP3 because they use SSL encryption to connect. Once you have chosen the protocol, amend the following line in the file /etc/dovecot/dovecot.conf:

protocols = pop3 pop3s imap imaps

It enables the protocols when dovecot is started. Next, add the following line in the pop3 section of the file /etc/dovecot/dovecot.conf:

pop3_uidl_format = %08Xu%08Xv

Next, choose the mailbox you use. Dovecot supports maildir and mbox formats. These are the most commonly used mailbox formats. They both have their own benefits and they are discussed on the dovecot website.

Once you have chosen your mailbox type, edit the file /etc/dovecot/dovecot.conf and change the following line:

mail_location = maildir:~/Maildir # (for maildir) or mail_location = mbox:~/mail:INBOX=/var/spool/mail/%u # (for mbox)

Once you have configured dovecot, start the dovecot daemon in order to test your setup:

sudo /etc/init.d/dovecot start

If you have enabled imap, or pop3, you can also try to log in with the commands telnet localhost pop3 or telnet localhost imap2. If you see something like the following, the installation has been successful:

bhuvan@rainbow:~$ telnet localhost pop3 Trying 127.0.0.1... Connected to localhost.localdomain. Escape character is '^]'. +OK Dovecot ready.

To configure dovecot to use SSL, you can edit the file /etc/dovecot/dovecot.conf and amend following lines:

ssl_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem ssl_key_file = /etc/ssl/private/ssl-cert-snakeoil.key ssl_disable = no disable_plaintext_auth = no

You can get the SSL certificate from a Certificate Issuing Authority or you can create self signed SSL certificate. Please refer to the section called “Creating a Self-Signed Certificate” for details about how to create self signed SSL certificate. Once you create the certificate, you will have a key file and a certificate file. Please copy them to the location pointed in the /etc/dovecot/dovecot.conf configuration file.

To access your mail server from another computer, you must configure your firewall to allow connections to the server on the necessary ports.