Pilot Microsoft 365 from my custom domain
You can pilot Microsoft 365 with these requirements and limitations:
Your current email provider must provide email forwarding.
You must manage your Microsoft 365 DNS records at your DNS hosting provider, rather than have Microsoft 365 manage these records for you.
To learn more, see Add DNS records to connect your domain.
Free/busy information for users on the other email server is not available.
Admins can't administer all user accounts from a single location.
Users might not be able to use Microsoft 365 spam filtering.
This is recommended for a very small number of users and only applies to the use of email for a pilot.
Set up a Microsoft 365 pilot
Follow these steps to set up a Microsoft 365 pilot:
Step 1: Sign in to the Microsoft 365 admin center
Sign in to the Microsoft 365 admin center with your work or school account.
Select Settings > Domains in the left navigation pane.
Step 2: Verify that you own the domain you want to use
On the Domains page, select Add domain.
Type the domain name in the box, select Use this domain, and then select Continue.
Select the services you want to test with your domain, like email and instant messaging.
On the Verify domain page, follow the step-by-step instructions, amd then select Verify.
It takes between a few minutes and 72 hours for DNS changes to take effect.
When verification is successful, you are asked to modify your DNS records.
Step 3: Mark the domain as shared in Exchange Online
In the Exchange admin center, in the Mail flow section, select Accepted domains, and then select the domain you want to modify.
Double-click to open the window, and then select Internal Relay.
This setting might require a few minutes to take effect.
Step 4: Unblock the existing email server (optional)
Microsoft 365 uses Exchange Online Protection (EOP) for spam protection. EOP might block your existing mail server if it detects a high volume of spam being forwarded by your current mail server. If you trust the spam protection for your other email provider, you can unblock the server in Microsoft 365.
Unblocking your existing email server allows any spam that arrives through your original server to come to the Microsoft 365 mailboxes, and you can't evaluate how well Microsoft 365 prevents spam.
In the Exchange admin center navigation pane, select Protection, and then select Connection filter.
In the IP Allow list, select +, and add the mail server IP address for your current email provider.
Step 5: Create user accounts and set the primary reply-to address
In the Microsoft 365 admin center left navigation, select Users > Active users.
Create two test accounts by adding two existing users.
For each account, select + Add a user, and fill out the required information, including the password method you want to test.
To ensure a user's email stays the same, the User name field must match the user's current email address.
Choose the appropriate license, click Next, and then click Finish adding.
Next to User name, select your custom domain name from the drop-down list.
Select Create > Close.
Step 6: **Configure mail to flow from Microsoft 365 or Office 365 to Email server
There are two steps for this:
Configure your Microsoft 365 or Office 365 environment.
Set up a connector from Microsoft 365 or Office 365 to your email server.
1. Configure your Microsoft 365 or Office 365 environment
Make sure you have completed the following in Microsoft 365 or Office 365:
To set up connectors, you need permissions assigned before you can begin. To check what permissions you need, see the Microsoft 365 and Office 365 connectors entry in the Feature permissions in Exchange Online topic.
If you want EOP or Exchange Online to relay email from your email servers to the Internet, either:
- Use a certificate configured with a subject name that matches an accepted domain in Microsoft 365 or Office 365. We recommend that your certificate's common name or subject alternative name matches the primary SMTP domain for your organization. For details, see Prerequisites for your on-premises email environment.
- Make sure that all your organization sender domains and subdomains are configured as accepted domains in Microsoft 365 or Office 365.
For more information about defining accepted domains, see Manage accepted domains in Exchange Online and Enable mail flow for subdomains in Exchange Online.
Decide whether you want to use mail flow rules (also known as transport rules) or domain names to deliver mail from Microsoft 365 or Office 365 to your email servers. Most businesses choose to deliver mail for all accepted domains. For more information, see Scenario: Conditional mail routing in Exchange Online.
You can set up mail flow rules as described in Mail flow rule actions in Exchange Online. For example, you might want to use mail flow rules with connectors if your mail is currently directed via distribution lists to multiple sites.
2. Set up a connector from Microsoft 365 or Office 365 to your email server
To create a connector in Microsoft 365 or Office 365, select Admin > Exchange to go to the Exchange admin center. Next, select mail flow > Connectors.
Set up connectors using the wizard.
To start the wizard, click the plus symbol +. On the first screen, choose From Office 365 and To Your Organization Mail server.
Click Next, and follow the instructions in the wizard. Click the Help or Learn More links if you need more information. The wizard will guide you through setup. At the end, make sure your connector validates. If the connector does not validate, double-click the message displayed to get more information, and see Validate connectors for help resolving issues.
Step 7: Update DNS records at your DNS hosting provider
Sign in to your DNS hosting provider's website, and follow the instructions at Add DNS records to connect your domain.
Make the following two exceptions:
Do not create a new MX record or change your existing MX record.
If you already have a Sender Policy Framework (SPF) record for your previous email provider, instead of creating a new SPF (TXT) record for Exchange Online, add "include:spf.protection.outlook.com" to the current TXT record.
For example, "v=spf1 mx include:adatum.com include:spf.protection.outlook.com ~all".
If you don't have an SPF record, modify the one recommended by Microsoft 365 to include the domain for your current email provider, and add spf.protection.outlook.com. This authorizes outgoing messages from both email systems.
Step 8: Set up email forwarding at your current provider
At your current email provider, set up forwarding for your users email accounts to your onmicrosoft.com domain:
Forward User A mailbox to firstname.lastname@example.org
Forward User B mailbox to email@example.com
When you complete this step, all email sent to firstname.lastname@example.org and email@example.com is available in Microsoft 365.
Contact your current email provider for the exact steps to set up email forwarding.
You don't need to keep a copy of messages at the current email provider.
Most providers forward email by leaving the Reply-to address of the sender intact so that replies go to the original sender.
Step 9: Test mail flow
Sign in to Outlook Web App using the credentials for User A.
Perform these tests:
Test local Microsoft email by sending an email, for example, to User B. The email is delivered immediately. In this scenario, the message is not routed to the mailbox for User B on your original server because the Microsoft 365 mailbox is local.
Test email to a user on the existing email system by sending an email, for example, to User C. The email is delivered to the mailbox for User C on your original mail server.
Verify that forwarding is set up properly from an outside account, or from an employee email account on the existing email system. For example, from the original server account for User C or a Hotmail account, send User A an email and verify that it arrives in the Microsoft 365 mailbox for User A.
Step 10: Move mailbox contents
Because you are moving only two test users, and User A and User B are both using Outlook, you can move the email by opening the old .PST file in the new Outlook profile and copying the messages, calendar items, contacts, and so on. For more information, see Import email, contacts, and calendar from an Outlook .pst file.
After they're imported to the appropriate locations in the Microsoft 365 mailbox, the items can be accessed from any device, anywhere.
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