[Microsoft 365] How to set up your own domain email in Exchange Online

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Whether or not you can use your own domain is an important point when choosing an email service for your business.

Additionally, a service with a high level of security while keeping costs down would be perfect.

By using “Exchange Online” provided by Microsoft 365, you can safely operate your own domain email.

In this article, we will explain how to use your own domain with Microsoft 365.

Benefits of using your own domain email for your business


If you just want to send and receive emails, Gmail or Yahoo!

However, it is definitely recommended to use your own domain for your corporate email address, even if it costs a little more.

By using your own domain, you can achieve branding and credibility for your company at the same time.

Advantages: Easy to remember

With your own domain, you can set the domain of your email address as your company name or brand name.

If the company name is included in the email address, you can tell which company the person is from just by looking at the address, making it easier to remember.

Advantage ② High reliability

If the contact information of the person you exchanged business cards with or the contact information on the company’s website were free emails, what kind of impression would you have of the company?

At the point of using a free address that anyone can obtain, there is a possibility that people will doubt whether it is a real company or whether it is a spoof or a fake site.

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It goes without saying that using a unique domain that includes your company name or brand name will greatly improve your credibility.

What you need to use your own domain email with Microsoft 365


When you issue a work account with Microsoft 365, the initial domain “〇〇.onmicrosoft.com” is automatically set.

I will explain how to change this to your company’s own domain.

First, let’s check what you need to prepare to use your own domain with Microsoft 365.

Own domain

If you don’t have your own domain yet, you’ll need a domain contract first.

You can get your own domain from a provider such as Onamae.com, or you can purchase it at the Microsoft 365 admin center.

How to purchase your own domain for Microsoft 365

  1. Open the Microsoft 365 admin center.
  2. Click Settings > Domains.
  3. Click “Buy Domain” to specify and purchase a domain.

Exchange Online license

In order to send and receive emails from your own domain with Microsoft 365, you need a license for the email service “Exchange Online” provided by Microsoft.

Exchange Online is included in many Microsoft 365 corporate plans, so if you want to use your own domain, you should choose a plan with Exchange Online.

Plans that include Exchange Online

The number in parentheses is the mailbox capacity per user.

  • Microsoft 365 Business Basic/Standard/Premium (50GB)
  • Office 365 E1 (50GB)
  • Office 365 E3/E5 (100GB)
  • Microsoft 365 E3/E5 (100GB)
  • Microsoft 365 F3/F5 (2GB)

Plans that do not include Exchange Online

  • Microsoft 365 Personal/Family
  • Microsoft 365 Apps for business
  • Microsoft 365 Apps for enterprise
  • Microsoft 365 F1

Single plan for Exchange Online

If you are already using a plan that does not include Exchange Online, or if you want to subscribe only for mail service, you can subscribe only for Exchange Online.

plan name mailbox capacity feature
Exchange Online (Plan 1) 50GB Advanced security, data protection
Exchange Online (Plan 2) 100GB DLP (Data Loss Prevention), Cloud Voicemail Service
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Microsoft 365 admin center settings


To use your own domain with Microsoft 365, make settings from the Microsoft 365 admin center.

  • Step 1. Add your own domain to Microsoft 365
  • Step 2. Set your own domain for users

We will explain each step in detail.

1. Add your own domain to Microsoft 365

Once you have your own domain, let’s add it to Microsoft 365 right away.

  1. Open the Microsoft 365 admin center.
  2. Click Settings > Domains.
  3. Click “Add Domain” and enter the acquired domain.
  4. Authenticate your domain. If you add a TXT record to your DNS records, check the TXT record information displayed on the screen.
  5. Open the provider’s domain management screen and register the TXT record confirmed in the previous section in the DNS record.
  6. Go back to the Microsoft 365 admin center and continue. It may take some time for the original domain to be reflected in Microsoft 365, so if it is not reflected, please wait for some time before proceeding to the next step.
  7. Choose how to connect your domain. Here we will explain the procedure when “Add your own DNS record” is selected.
  8. Register the displayed MX record, CNAME record, and TXT record on the provider’s domain management screen.

2. Set your own domain for users

After the domain is reflected, set the domain to the user.

The initial value of Microsoft 365 is set to the domain “〇〇.onmicrosoft.com”, so change this to your own domain.

Assign your own domain when creating a user

  1. Open the Microsoft 365 admin center.
  2. Click Users > Active Users.
  3. Click Add User.
  4. Enter basic user information.
  5. Select your own domain from the “Domain” dropdown.
  6. Setting the license and options completes creation.

Change existing users to your own domain

  1. Open the Microsoft 365 admin center.
  2. Click Users > Active Users.
  3. Click on the appropriate user.
  4. Click Manage Usernames and Email Addresses.
  5. Edit the “Primary email address and username”.
  6. Enter your user name in “Alias” and select your own domain from the pulldown.
  7. Click Add.
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Article Summary


If you use email for business, you definitely want to use your own domain.

With Microsoft 365’s Exchange Online, there is no need to subscribe to individual mail servers, and management can be centralized.

Especially if you use Outlook as your email app, you can get a comfortable cloud email environment by using it in combination with Exchange Online.

Please feel free to contact NEC NETS & SI for consultation on choosing the best plan for your company and customization.