The Cname record you added when you set up in the domain provider is essential for Mailgun to track the open and click tracking, and unsubscribed.

The record for email.mg.yourdomain.com should be pointing to Mailgun.org, that's how they are able to fetch data and show the email stats.

If you are seeing this error when clicking the link: This site can't be reached /  says email.mg.yourdomain.com refused to connect when you have your own Mailgun domain/subdomain set up

That means the CNAME record might not be set up properly.

1. To verify that, copy the red highlighted in the image above ---> email.mg.yourdomain.com

Depending on the subdomain you set up with Mailgun, 

For example:

If you set up mg.companyname.com,

You will look up the cname record for email.mg.companyname.com

If you set up replies.companyname.com,

You will look up the cname record for email.replies.companyname.com

If you set up support.companyname.com,

You will look up the cname record for email.support.companyname.com

2. Go to MX toolbox or Whatsmydns to look up the Cname record:

MX toolbox:

Whatsmydns:

3. If it says DNS records not found:

    a. login to your domain provider 

    b. Go to DNS records and check the CNAME record

4. If it is already pointing to mailgun.org:

    a. Go to Mailgun -> Click the Sending tab on the left -> Domain Settings

    b. Edit the Tracking Protocol

    c. Send the email test again from HighLevel

5. If the info above does not help, please get in touch with the support team of your domain provider for assistance. You can show them we need to add these records here: 

6. If the domain provider verified all DNS records are good to go, please reach out to HL support.

Common issues:

1. If The CNAME record includes the root domain, it will not work here:

If you are using GoDaddy or Namecheap, be sure to omit the root domain from the record so it is email.mg only

Host name:

Depending on the subdomain you are trying to set up, if you are trying to set up

mg.companyname.com The host name will be email.mg

replies.companyname.com The host name will be email.replies

support.companyname.com The host name will be email.support