What is Dovecot Server?

Dovecot is an open-source IMAP and POP3 email server for Linux/UNIX-like frameworks written with security primarily in mind. It is a Mail Delivery Agent. Dovecot is easy to set up and requires almost no memory. It allows users to access their mailboxes using the IMAP interface. If configured correctly, it only interacts with authenticated users.

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Installing Dovecot Server

To install a basic Dovecot server with common POP3 and IMAP functions, run the following command:

sudo apt install dovecot-imapd dovecot-pop3d

Once the Dovecot is installed, you can enable and start it:

sudo systemctl enable dovecot
sudo systemctl start dovecot

Configuring Dovecot

The main config file of Dovecot is located at /etc/dovecot/dovecot.conf. We will be looking at three main options:

listen: This options allows you to set the IP address where you want to listen. You can use an asterik (*) which the wildcard meaning all IPv4 address and for IPv6 addresses you can use (::). To use both it should be like:

listen = *, ::

protocols: This option allows you to specify which protocols you would like to support such as POP3, IMAP. LMTP is also listed here as well which stands for Local Mail Transfer Protocol:

protocols = imap, pop3, lmtp

mail_location: This option sets from where the mail is picked up. By default, this setiing is empty, which means that Dovecot attempts to locate your mail automatically. The format of the mailbox location specification option is as follows:

mailbox-format : <path> [ : key = <value> … ]

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