By default, because our intranet and Internet domain names are different, exchange cannot receive emails even if other configurations are correct, because our email suffixes are different, therefore, we need to add the Internet domain name to the accepted domain of exchange.
1. log on to the EAC (ECP), select the mail flow, click the accepted domain, and click the plus sign to add the accepted domain.
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2. Enter the corresponding name, enter the Internet domain name, select the authoritative domain, and save
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3. in this way, the accepted domain has been added to exchange, but note that the user's email suffix will not change directly. If you view the user attributes, you will find that the email address is still the previous username @ contoso.com. If you want to change the username to the username @ mxyo365.com, you can add an email address policy, click the email receiving policy, and click the plus sign to add
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4. Enter the Policy Name and click the plus sign to add the email format.
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5. Select an accepted domain. The Internet domain name added previously can be seen here.
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6. Select the recipient container and click Save.
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7. A warning will pop up later. Although the email address policy has been created, it will not be applied by default.
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8. Click Application
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9. A warning is prompted. You can ignore it here.
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10. If you open the user information again, you can see that there are more email addresses @ mxyo365.com.
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11. Double-click the default receiving connector. Here, the anonymous user is also checked. Note that this operation must be performed on the two mailbox servers.
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In this way, you can receive emails from the Internet after completing other configurations.
This article is from the "Just make it happen" blog, please be sure to keep this source http://mxyit.blog.51cto.com/4308871/1553280
Configure email address policies from exchange to Office 365 series (10)