How do I change the email address Microsoft Bookings sends from?

Why "Send customer replies to" didn't fix it#

Under Business information → Basic details there is a field called Send customer replies to. Microsoft describes it as the address "where email replies to booking confirmations and reminders should be forwarded". It sets the reply-to, not the sender.

That catches a lot of people. In an accepted Microsoft Q&A answer from 2020, the explanation was that Bookings "will not change it": the sending address is the mailbox's primary SMTP address, and only an admin can change that. Microsoft's FAQ says the sender domain is "controlled and managed at the Microsoft 365 settings level" and depends on your domain configuration.

Still worth filling in, so replies reach a monitored inbox.

Fix an existing booking page#

This is done in Exchange Online PowerShell by an admin. Microsoft's Teams admin documentation gives this command for moving a booking mailbox off the default domain:

Set-Mailbox -Identity YourBusiness@contoso.onmicrosoft.com `
  -WindowsEmailAddress YourBusiness@contoso.com `
  -EmailAddresses YourBusiness@contoso.com

Before running it:

1. Confirm the domain is verified in the Microsoft 365 admin center under Settings → Domains, and that SPF and DKIM are set up for it, so the new sender passes authentication.
2. Pick the address you want customers to see, such as appointments@ or book@, since it will appear on every email.
3. Expect the booking page URL to change too. The public link is built from the same address. Community reports say the old link redirects, but links on your website, embeds and ads should be updated. See changing the Bookings page URL for the caveats.
4. Send a test booking to an external address (Gmail or Outlook.com) and check the From line and whether it lands in the inbox.

If you use an Exchange hybrid setup, Microsoft recommends testing mail flow between on-premises Exchange and Exchange Online after the change.

Set the domain before creating new pages#

To stop new pages getting an onmicrosoft.com address in the first place, an admin can set the domain Bookings uses for new booking mailboxes through the OWA mailbox policy:

Get-OwaMailboxPolicy -Identity OwaMailboxPolicy-Default | Format-List BookingsMailboxDomain
Set-OwaMailboxPolicy -Identity OwaMailboxPolicy-Default -BookingsMailboxDomain "contoso.com"

Microsoft's documentation is explicit that "this change will not impact shared booking pages that have already been created". A Feedback Portal idea asking for it to apply to existing pages (18 votes) is still open, so existing pages need the Set-Mailbox fix above. You can also create a separate policy with a different domain and assign it only to certain users.

If you have no admin access#

Some small tenants, for example those set up through a hosting provider, don't give the business owner easy access to Exchange settings. In that case, ask whoever manages your Microsoft 365 subscription to run the change. Deleting and recreating the page after the default domain is fixed is the other route, but deletion is permanent and needs admin rights too.

Why it matters#

Mail from an onmicrosoft.com address is more likely to be flagged: Microsoft's own Teams admin guidance warns that invites from the default domain may be flagged as spam and moved to junk. Several Q&A threads also report confirmations rejected with "550 5.7.1" errors by strict receivers. If that's your symptom, see Bookings emails going to spam or bouncing.