Mailu with Let's Encrypt Using Docker Compose

📙 The complete installation guide is available on my website.

❗ Change variables in the .env to meet your requirements.

To generate a 128-bit security key for the SECRET_KEY variable, use the following OpenSSL command:

openssl rand -hex 16

💡 Note that the .env file should be in the same directory as mailu-traefik-letsencrypt-docker-compose.yml.

Set up the following DNS and firewall configurations for our Mailu email server on yourdomain.com:

DNS Records

A Records

• mailu.yourdomain.com → [Server IP]
• admin.mailu.yourdomain.com → [Server IP]
• webmail.mailu.yourdomain.com → [Server IP]
• webdav.mailu.yourdomain.com → [Server IP]
• traefik.mailu.yourdomain.com → [Server IP]

MX Record

• yourdomain.com MX → mailu.yourdomain.com (Priority: 10)

SPF Record

• TXT yourdomain.com → v=spf1 a mx ~all

DKIM Record

• TXT mail._domainkey.yourdomain.com → (DKIM Key)

DMARC Record

• TXT _dmarc.yourdomain.com → v=DMARC1; p=none; rua=mailto:admin@yourdomain.com

PTR Record

• [Server IP] → mailu.yourdomain.com

Firewall Ports to Open

• SMTP: 25, 465, 587
• IMAP/POP3: 143, 993, 110, 995
• Sieve: 4190
• Web Traffic: 80, 443

Replace [Server IP] and (DKIM Key) with the appropriate values for your server.

Create networks for your services before deploying the configuration using the commands:

docker network create traefik-network

Deploy Mailu using Docker Compose:

docker compose -f mailu-traefik-letsencrypt-docker-compose.yml -p mailu up -d

Administrator Account

Set password for administrator account. Replace PASSWORD with a strong, secure password:

docker compose -p mailu exec admin flask mailu admin admin yourdomain.com PASSWORD

Author

I’m Vladimir Mikhalev, the Docker Captain, but my friends can call me Valdemar.

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