Mailgun Setup - Google Domain Setup
Email Infrastructure Mailgun + Google Domains Setup Step-by-step DNS configuration for connecting Mailgun to a domain registered with Google Domains…
4 min read885 words13 explained imagesUpdated Wed, 1 Jul at 7:14 AM
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Email Infrastructure
Mailgun + Google Domains Setup
Step-by-step DNS configuration for connecting Mailgun to a domain registered with Google Domains.
What You'll Learn
This guide walks through signing up for Mailgun, adding your domain, and configuring the five DNS records Mailgun requires — two TXT records, both MX values, and one CNAME — inside Google Domains.
It also covers how to avoid breaking your existing Google Workspace/Gmail mail delivery while adding Mailgun's records.
Table of Contents
Video Recap
1Sign up for Mailgun & add your domain
Step 1
Sign up at Mailgun.com, then check your inbox to verify your email address.
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
Step 2
Log in to Mailgun, then click Sending → Add New Domain.
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
Step 3
If your domain is companyname.com, decide whether to set up the main domain or a subdomain with Mailgun.
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
Important
Set up the domain or subdomain under the US region — not EU.
Click Add domain.
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
2Access DNS records in Google Domains
Now log in to your DNS records and add the 5 DNS records Mailgun requires.
- Log in to domains.google.com.
- Click into the domain you're trying to set up.
- Click DNS on the left panel — this is where you'll add all 5 records.
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
3Add the 1st TXT record (SPF)
Fields
Host name:
- mg.companyname.com → host name is mg
- replies.companyname.com → host name is replies
- Main domain (companyname.com) → host name is @
Type: select TXT from the dropdown.
Data: paste the first copied TXT record — v=spf1 include:mailgun.org ~all.
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
Note
Don't click Save yet — there are 4 more records to add. Once you've finished this record, click Create new record and move to the next section.
4Add the 2nd TXT record (DKIM)
Fields
Host name: this part is a little tricky. Copy everything from the beginning of the value up until the subdomain part — do not copy the main domain.
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
| Example | Highlighted part to copy |
|---|---|
| Using a subdomain |
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
Illustrative values showing the expected format. They are not read from the screenshot. All 2 steps in this procedure
|
| Using the main domain |
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
Illustrative values showing the expected format. They are not read from the screenshot. All 2 steps in this procedure
|
Type: select TXT from the dropdown.
Data: paste the second, longer TXT record here.
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
5Add the MX records
Click Create new record.
Fields
Host name:
- mg.companyname.com → host name is mg
- replies.companyname.com → host name is replies
- Main domain → host name is @
Type: select MX from the dropdown.
Data: Google Domains lets you add both MX values to the same record.
- Copy and paste 10 mxa.mailgun.org
- Click +Add more to this record
- Copy and paste 10 mxb.mailgun.org
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
6Add the CNAME record
Click Create new record.
Fields
Host name:
- mg.companyname.com → host name is email.mg
- replies.companyname.com → host name is email.replies
- Main domain (companyname.com) → host name is email
Type: select CNAME from the dropdown.
Data: copy and paste mailgun.org.
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
7Verify DNS & finish setup
Now that you've added all 5 DNS records, click Save.
Go back to Mailgun and click Verify DNS Settings. If some records still aren't showing a green checkmark, click the same button again — DNS propagation can take a little time.
Fields in this part of the guide
mg.companyname.com → host name is mgreplies.companyname.com → host name is repliesMain domain (companyname.com) → host name is @Main domain → host name is @mg.companyname.com → host name is email.mgreplies.companyname.com → host name is email.repliesMain domain (companyname.com) → host name is email
Buttons and menus referenced
Sending → Add New Domaincompanyname.comANYTHING_HEREUSAdd domainDNSmgreplies@TXTCreate new recorddo not copy the main domain
Example values
- Main domain (companyname.com) → host name is email
- priya.raman@northgatedental.com
Illustrative values showing the expected format. They are not read from the screenshot.
All 2 steps in this procedure
- Main domain: if you use the main domain, it should not also be used with Google Workspace or any other email provider — see Mailgun's guidance on sharing a domain with another email server.
- Subdomain: type ANYTHING_HERE.companyname.com — for example mg.companyname.com, replies.companyname.com, or support.companyname.com.
Next Steps
Once all records are verified, grab your Mailgun API key and add it to your email service settings.
Then send a test email to confirm everything works — see how to send a test email in the Conversation.
8Frequently Asked Questions
Q: Why does Google Domains only need one MX record instead of two?
Google Domains lets you add multiple values to a single MX record using "+Add more to this record," so both mxa.mailgun.org and mxb.mailgun.org live under one record instead of two separate ones.
Q: Why shouldn't I click Save after adding just the first record?
You can save at any point, but it's easier to add all 5 records first and save once at the end, rather than saving and reopening the DNS page repeatedly.
Q: Will this affect my existing Google Workspace or Gmail email?
Not if you use a subdomain for Mailgun rather than your main domain, and leave your existing Google Workspace MX records on the main domain untouched.
Q: How long does DNS propagation take in Google Domains?
Usually fast, but it can occasionally take a few hours. If a record isn't showing green yet in Mailgun, wait a bit and click Verify DNS Settings again.
Q: What priority value do I use for the MX record?
Use 10 for both mxa.mailgun.org and mxb.mailgun.org — this is entered right before the value, for example "10 mxa.mailgun.org".
Q: What do I do after all 5 records show a green checkmark?
Grab your Mailgun API key, add it to your email service settings, and send a test email in a conversation to confirm delivery is working.
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