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Accept Domain on Office 365

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Hello

Our company abc.com recently purchased xyz.com.

Xyz.com users needs to send email as us using our domain abc.com. Abc.com will become the primary email domain for these users.

Xyz.com is currently hosted on Exchange online 100%.

Without migration can we allow users of xyz.com to send as abc.com?

ABC.com also has an office 365 subscription.

The idea was to create an accepted relay domain and change all the xyz.com users to abc.com to allow them to send as us.

When their emails are replied to, the email arrive at abc.com exchange server and then forwarded back to their old xyz.com email domain.

Any help would be appreciated.

Wednesday, August 23, 2017 4:17 PM

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You should read this,

https://practical365.com/exchange-server/change-business-email-domain/

Please click on "Mark as Answer" and “Vote as Helpful” on the post that helps you, this can be beneficial to other community members.
- Edited by Muhammad Faisal Sharif Wednesday, August 23, 2017 4:22 PM
Wednesday, August 23, 2017 4:21 PM
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This would not apply. As the accepted domain list can be only added via the office 365 portal for xyz.com.

We cant add abc.com via the office portal, because we already have our own office 365 tenant.

Also we are on Exchange 2013

Wednesday, August 23, 2017 4:33 PM
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Hi.

You change domain ABC.com from Authoritative to Internal relay, and create route connectors with mx record.

I think you can add second domain abc.com for xyz.com users.

You can create outgoing rule for xyz.com with address rewriting. Custom routing of outbound email

This is need check and ask office support. Exchange Online also supports Address Rewrite, which routes outgoing email through an on-premises gateway that modifies the addresses.

About sync contact list you need use Microsoft Identity Manager 2016

Important notice for Office 365 email customers who have configured connectors

Office 365 inter-tenant collaboration

MCITP, MCSE. Regards, Oleg
- Edited by Oleg.Kovalenko Wednesday, August 23, 2017 6:10 PM
Wednesday, August 23, 2017 4:52 PM
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The problem is office 365 does not allow you add the domain at all, either as relay or authoratative

Wednesday, August 23, 2017 5:11 PM
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You have two way. : ) Merge or continue use two different organization with partner setting.

Office 365 inter-tenant collaboration

How to migrate mailboxes from one Office 365 tenant to another

Company Merger, Two Active Directory Domains, One Office 365 Tenancy, One onsite Exchange Server

Thank you for interesting question. :)

MCITP, MCSE. Regards, Oleg
- Edited by Oleg.Kovalenko Wednesday, August 23, 2017 7:40 PM
- Proposed as answer by Allen_WangJF Friday, August 25, 2017 12:02 PM
Wednesday, August 23, 2017 7:22 PM
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Hi,

As we know, one domain name can only be added to one Office 365 tenant as you said above.
Also, the trust between two Office 365 tenants is not supported in Azure AD.

Therefore, we can merge those two tenants into one Office 365 tenant if you want to deploy send as permission as Oleg mentions in second link, i.e. How to migrate mailboxes from one Office 365 tenant to another.
Regards,

Allen Wang

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- Proposed as answer by Allen_WangJF Monday, September 4, 2017 3:39 PM
Friday, August 25, 2017 12:08 PM