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* feat: add email service and SMTP configuration to docker-compose - Introduced a new email service in docker-compose with environment variables for SMTP configuration. - Updated Caddyfile to route SMTP traffic for email service. - Added necessary SMTP ports and health checks for the email service. - Updated variables.env to include email-related configurations and replicas. * refactor: clean up Caddyfile SMTP routing configuration - Simplified the indentation and formatting of the SMTP routing sections in the Caddyfile. - Ensured consistent structure for the proxy routes for email services on specified ports. * fix: update SMTP domain binding in Caddyfile - Changed the SMTP domain binding in the Caddyfile to use '0.0.0.0' for specified ports (10025, 10465, 10587) to allow connections from all network interfaces. - This adjustment enhances the accessibility of the email service routing configuration. * fix: update mail server testing instructions in README - Changed placeholder from `<mail-domain>` to `<host-domain>` for clarity in SMTP connection testing instructions. - This update improves the accuracy of the documentation for users testing their mail server setup. * feat: enhance email service configuration in docker-compose and Caddyfile - Added SMTP environment variables to coolify-compose.yml for better email service configuration. - Updated docker-compose-caddy.yml to remove redundant SMTP_DOMAIN variable. - Modified Caddyfile to simplify SMTP domain binding for email service routes. - Ensured proper permissions for TLS directory in email Dockerfile. * refactor: remove email service environment variables in coolify-compose.yml --------- Co-authored-by: akshat5302 <akshatjain9782@gmail.com>
Required DNS Records for Receiving Mail Server
1. A Record
HOST-DOMAINpoints to the server running the email service (e.gplane.example.com).
This can also be replaced with CNAME record of cloud load balancer.
Type: A
Host: <host-domain>
Value: <public-ip-address>
TTL: Auto | 3600
2. MX Record
MAIL-DOMAINrefers to incoming email domain e.g.intake.example.com
Type: MX
Host: <mail-domain>
Value: <host-domain>
Priority: 10
TTL: Auto | 3600
3. SPF Record
Type: TXT
Host: <mail-domain>
Value: "v=spf1 ip4:<A-record-ip-host-domain> -all"
TTL: Auto | 3600
4. DMARC Record
Type: TXT
Host: _dmarc.<mail-domain>
Value: "v=DMARC1; p=reject; rua=mailto:<valid-email-addr>"
TTL: Auto | 3600
Verification Commands
# Verify A record
dig A <mail-domain>
# Verify MX record
dig MX <mail-domain>
# Verify SPF record
dig TXT <mail-domain>
# Verify DMARC record
dig TXT _dmarc.<mail-domain>
You can also visit https://mxtoolbox.com/ to know the issues with your DNS records configuration.
Common Issues and Solutions
-
MX Record Issues:
- Ensure proper dot at end of domain
- Check priority number (lower = higher priority)
- Allow 24-48 hours for propagation
-
A Record Issues:
- Verify IP address is correct
- Ensure mail subdomain matches MX record
Testing Mail Server Setup:
# Test SMTP connection
telnet <host-domain> 25
telnet <host-domain> 465
telnet <host-domain> 587