Email Migration

Trial Microsoft 365 with Selected Mailboxes Without Changing MX Records

Maira Mehtab Oct 13, 2026 869 views

Question details

A company wants to trial Microsoft 365 for a few selected users and a shared folder without modifying the domain's MX records.

How to Trial Microsoft 365 with Selected Mailboxes Without Changing MX Records

Product: Microsoft 365
Device & OS: not provided
Scenario: Trialing Microsoft 365 services such as Teams, calendars, and file sharing alongside an existing third-party IMAP email provider.
Observed behavior: The user needs a method to route emails and test services for a few specific users in Microsoft 365 before committing to a full domain migration.

Before you start

Ensure you have administrative access to your current IMAP email provider's routing settings and the Microsoft 365 admin center before beginning the trial setup.

Solution 1Recommended

Use Email Forwarding to Temporary Microsoft 365 Addresses

Keep your existing IMAP service active and forward specific mailboxes to temporary Microsoft 365 addresses to test functionality without altering domain DNS settings.

This method allows a select number of users to experience the Microsoft 365 email environment safely. Since the MX records remain pointed to your original IMAP provider, the rest of the company is entirely unaffected.

Provision Microsoft 365 accounts

Set up Microsoft 365 using the default '.onmicrosoft.com' domain for the designated trial users.

Access your IMAP admin panel

Configure email forwarding

Set up email forwarding for the selected trial users so that copies of their incoming mail are automatically routed to their temporary '.onmicrosoft.com' addresses.

Set up outbound mail

Configure outbound mail settings in the Microsoft 365 admin center so trial users can send test emails, noting that replies will route back through the IMAP server.

Use Email Forwarding to Temporary Microsoft 365 Addresses

Outbound Routing Consideration: If trial users need to send messages originating strictly from the company domain rather than the temporary address, careful outbound routing or a full implementation may be required.

Solution 2

Trial Collaboration Tools While Keeping Email on IMAP

Avoid email routing complications entirely by testing Microsoft 365's collaboration tools while keeping mail strictly on your current IMAP setup.

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Frequently Asked Questions

Can I send emails from my company domain during a Microsoft 365 trial?

Yes, but sending outbound emails using your company domain while keeping incoming mail routed to an IMAP server requires configuring domain verification and careful mail routing in the Microsoft 365 Exchange admin center.

Will changing MX records disrupt my current email flow?

Yes, changing your domain's MX records will immediately route all incoming mail for the entire domain to Microsoft 365. This is why forwarding from your IMAP provider to temporary addresses is recommended for small-scale trials.

Do I need to migrate all users at once to Microsoft 365?

No, you can perform a staged or hybrid migration. However, maintaining two separate email environments for the same domain requires complex administration compared to simple mailbox forwarding for a limited trial.

Migration & Recovery