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sudo useradd -m -G mail username
sudo passwd username

1. Configure DNS Records:

   For your mail server to function properly, you need to set up two DNS records for your domain:

   • MX Record: This points to your mail server as the destination for incoming emails. You’ll need to create an MX record with your domain registrar’s control panel.
   • A Record (Optional): An A record for your mail server hostname (e.g., mail.yourdomain.com) might be required by some email clients.

   Important: DNS propagation can take up to 24 hours, so emails might not be delivered immediately.

2. Secure Your Server:

   • Enable firewall rules to restrict access to your mail server.
   • Consider using additional security measures like Postfix’s Sender Policy Framework (SPF) to prevent spam.
   • Keep your server software updated for security patches.

Additional Considerations:

• Receiving Emails: By default, Postfix only relays emails. To allow receiving emails, you’ll need to configure an additional service like Dovecot.
• Email Client Configuration: Users will need to configure their email clients with the mail server hostname (e.g., mail.yourdomain.com) and their login credentials.

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