Autodiscover Subdomain – What It Is and How to Configure It

What is an Autodiscover Subdomain?

The Autodiscover subdomain (autodiscover.yourdomain.com) is used by email clients (such as Outlook, Thunderbird, and mobile apps) to automatically configure email settings without the need to manually enter server details.

Why is Autodiscover Important?

• Automatically configures email settings (IMAP, SMTP, and Exchange).
• Reduces errors during manual configuration.
• Used in Microsoft 365, Exchange, cPanel, and Plesk-based email hosting.

The Autodiscover service is essential for minimizing user configuration steps and provides clients with access to Exchange features[citation:1]. When setting up a client application like Outlook for the first time, it configures itself using the Autodiscover service[citation:1].

Set up CNAME or A Record for Autodiscover

Option 1: CNAME Record (For Microsoft 365, Outlook, Exchange)

If you are using Microsoft 365 (Office 365) or Exchange, configure this CNAME record in your DNS settings. This record allows Outlook to easily connect to the Exchange Online service using the Autodiscover service[citation:5].

Steps to add in DNS:

1. Log in to your cPanel, Cloudflare, or domain registrar (GoDaddy, Namecheap, etc.).
2. Go to the DNS management section.
3. Add a new CNAME record:
   Host: autodiscover Type: CNAME Value: autodiscover.outlook.com TTL: 3600
4. Click "Save".

This allows Outlook and Microsoft 365 to automatically detect email settings.

Option 2: A Record (For Custom Mail Servers)

If you are not using Microsoft 365 and have a custom mail server (e.g., cPanel, Plesk, Postfix, Exim, or Zimbra), configure an A record.

Steps:

1. Find the IP address of your mail server.
2. Add an A record with your DNS provider:
   Host: autodiscover Type: A Value: 192.168.1.10 (Replace with your actual mail server IP) TTL: 3600
3. Click "Save".

Now mail clients can automatically discover and connect to your mail server.

Configure Autodiscover on the Web Server

If you host your own mail server, ensure Autodiscover is enabled. Exchange automatically creates a virtual directory named autodiscover in IIS services upon installation[citation:1].

For Apache Web Server

1. Create an autodiscover configuration file:
   sudo nano /etc/apache2/sites-available/autodiscover.conf
2. Add the following:
   ServerName autodiscover.yourdomain.com DocumentRoot /var/www/autodiscover AllowOverride All Require all granted
3. Save and enable the site:
   sudo a2ensite autodiscover.conf sudo systemctl restart apache2

Your server can now handle Autodiscover requests.

Verify Autodiscover Functionality

Check the Autodiscover DNS Record

Linux/macOS

Expected Output (For Microsoft 365):

Expected Output (For custom mail server with A record):

Windows (Command Prompt)

If there is no output, DNS changes haven't propagated yet (wait 24-48 hours).

Test Autodiscover in Microsoft Outlook

1. Open Outlook.
2. Click File > Account Settings > Email Account Setup.
3. Click "Create" and enter your email address.
4. Click "Next" > Outlook should automatically discover and configure settings.

If setup completes without errors, Autodisover is working.

Use Microsoft Remote Connectivity Analyzer

For Microsoft 365 or Exchange, test autodiscover[citation:3]:

• Go to Microsoft Remote Connectivity Analyzer.
• Select "Microsoft 365 Autodiscover Test".
• Enter your email (yourname@yourdomain.com) and click "Test".

If the test passes, Autodiscover is working correctly.

Troubleshooting Autodiscover Issues

Summary

Your Autodisover subdomain is now correctly configured!