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On Demand Migration Current - User Guide

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Address Rewriting Scenarios

Address Rewriting supports the following scenarios:

  • Replace senders’ address with the target primary email address.
  • Replace senders’ address with the source primary email address.

NOTE:

  • The address is only rewritten in the mail that goes to the recipients outside your organization. Internal users receive the mail with the original address. Microsoft
  • M365 Advanced Threat Protection default settings may cause issues with the Address Rewriting Service. Please ensure that "Automatic forwarding" is set to "On" in the "Outbound spam filter policy" for your source or target tenant depending on the rewriting scenario you choose.

Rewriting senders’ address to the target address

Use case: users from the source tenant need to communicate with external recipients from the name of the target organization. It usually happens when the mail migration is not yet finished, but you want to use the consistent branding.

To rewrite senders’ address to ones from the target select To target for the Rewrite senders’ address to on the Domain Coexistence widget. You cannot change this setting after Address Rewrite Service is provisioned.

Check Senders' Address property on the Mailboxes tab to find the effective email address after rewriting. If the account don't have the Exchange mailbox provisioned in the target tenant (mail user), the target primary SMTP address is used for address rewriting.

IMPORTANT: We recommend that all incoming mail is automatically redirected to the source mailbox. Set Mail Flow for the mailbox to To source.

Rewriting senders’ address to the source address

Use case: migrated users need to communicate with external recipients from the name of the source organization. It usually happens when you need to keep the original brand while merging all accounts in the target tenant.

To rewrite senders’ address to ones from the source select To source for the Rewrite senders’ address to on the Domain Coexistence widget. You cannot change this setting after Address Rewrite Service is provisioned.

Check Senders' Address property on the Mailboxes tab to find the effective email address after rewriting.

IMPORTANT: We recommend that all incoming mail is automatically redirected to the target mailbox. Set Mail Flow for the mailbox to To target.

Provisioning the Address Rewrite Service

IMPORTANT: After Address Rewrite Service provisioning starts, you cannot change the setting of the sender's address to be rewritten.

  1. Open the project dashboard.
  2. Click Provision for Address Rewrite Service from the Domain Coexistence widget.
  3. Wait until the service is provisioned and Exchange Server Integration is successfully configured.

The provisioning might take some time. In the meanwhile, you can select the mailboxes for the address rewriting.

Selecting Mailboxes for Address Rewriting

  1. Log in to Quest On Demand and choose an organization if you have multiple organizations.
  2. From the navigation pane, click Migration to open the My Projects list.
  3. Create a new project or open an existing project.
  4. Click the Accounts tile, or click Open from the Accounts tile to open the Accounts and User Data dashboard.
  1. Click the Mailboxes tab or click Select in the Domain Coexistence tile.
  1. Click Off in Address Rewrite facet to show the mailboxes that are ready for address rewriting.

IMPORTANT: Address Rewrite Service only works with accounts that have pairs in the target tenant. You can click Not Supported in Address Rewrite facet to see the mailboxes that are not ready for address rewriting.

  1. Select the mailboxes and click Address Rewrite.
  2. In Address Rewrite Management task, select Turn on address rewriting for selected mailboxes.
  3. Click Next to view the task summary. Check selected options, name the task, and click Finish to start the task.
  4. The task is created. You can track its progress in the Tasks or monitor alerts and notifications in the Events.

You can add the mailboxes to address rewriting at any time. Note, that if the Address Rewriting Service is already enabled, it might take a while before the rewriting will be enabled for the newly added mailbox. Check that Address Rewrite status is On for the mailbox.

Configuring SPF Record

During the provisioning phase, we configure the target Exchange Server to correctly handle messages, processed by Address Rewrite Service. If you want to be absolutely sure that the messages are not blocked by custom filters and antiviruses, add the service's IP address to SPF record in target DNS.

  • On Domain Coexistence widget, click Running to locate the event containing IP address of the Address Rewrite Service server.
  • Add the IP address to the SPF record in the target DNS. See provider's documentation for instructions.
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