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Dovecot is the most widely used open-source IMAP/POP3 server, letting mail clients (phones, webmail, desktop apps) retrieve and synchronize messages stored on your mail server. This guide pairs with Postfix to complete a self-hosted mail setup.

Prerequisites

• Postfix already installed and configured
• Ubuntu 22.04/24.04 or Debian 11/12 VPS
• Root or sudo access

Step 1 — Install Dovecot

sudo apt update
sudo apt install dovecot-core dovecot-imapd dovecot-pop3d -y

Step 2 — Configure Mail Storage Location

sudo nano /etc/dovecot/conf.d/10-mail.conf

mail_location = maildir:~/Maildir

Step 3 — Enable IMAP and POP3

sudo nano /etc/dovecot/conf.d/10-master.conf

Confirm the IMAP and POP3 services are uncommented and listening.

Step 4 — Configure Authentication

sudo nano /etc/dovecot/conf.d/10-auth.conf

disable_plaintext_auth = yes
auth_mechanisms = plain login

disable_plaintext_auth = yes requires encryption for authentication — essential once TLS is configured, to prevent credentials from being sent in plaintext.

Step 5 — Enable TLS

sudo nano /etc/dovecot/conf.d/10-ssl.conf

ssl = required
ssl_cert = </etc/letsencrypt/live/mail.yourdomain.com/fullchain.pem
ssl_key = </etc/letsencrypt/live/mail.yourdomain.com/privkey.pem

Step 6 — Restart Dovecot

sudo systemctl restart dovecot
sudo systemctl enable dovecot

Step 7 — Open Required Ports

sudo ufw allow 993/tcp
sudo ufw allow 995/tcp

Step 8 — Connect Postfix to Dovecot for Authentication

Edit Postfix to use Dovecot's SASL authentication for outbound mail submission:

sudo nano /etc/postfix/main.cf

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes

sudo systemctl restart postfix dovecot

Step 9 — Test the IMAP Connection

openssl s_client -connect mail.yourdomain.com:993

You should see a successful TLS handshake followed by a Dovecot greeting.

Step 10 — Configure a Mail Client

Common Errors

"Connection refused" on port 993 — confirm Dovecot is running and the firewall rule was added:

sudo systemctl status dovecot

Authentication failed — verify the user's system account exists and password is correct; Dovecot commonly authenticates against system accounts or a separate user database depending on configuration.

TLS handshake errors — verify certificate paths and that the certificate is valid for the exact hostname being used to connect.

Best Practices

• Always require TLS (ssl = required) for both authentication and data transfer
• Disable plaintext authentication once TLS is confirmed working
• Keep certificates renewed — see How to Renew and Auto-Renew Let's Encrypt Certificates

FAQ

Do I need both IMAP and POP3?
Not necessarily — IMAP alone is sufficient for most modern use cases; only enable POP3 if a specific client or workflow requires it.

Related Articles

• How to Install and Configure Postfix as a Mail Transfer Agent
• SMTP vs IMAP vs POP3: Understanding Email Protocols
• How to Set Up a Complete Mail Server (Postfix + Dovecot + SPF/DKIM/DMARC)