Creating / Changing an Address Alteration Policy

Document created by user.oxriBaJeN4 Employee on Sep 11, 2015Last modified by user.oxriBaJeN4 Employee on Mar 27, 2017
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Address Alterations policies can be used to modify email addresses as inbound or outbound messages are processed for delivery. This can be configured for addresses based on the:

  • Sender or recipient email address
  • Header or envelope information




There are many reasons why you may require either inbound or outbound addresses to be rewritten. For example:

  • A company merger where all emails going to acquired company now need to be rewritten to the new company domain.
  • Your organization has a requirement to modify address information based on mail flow. For example, all inbound emails destined for "" needs to be delivered to "".
  • When any sender from a Support Desk group sends an outbound email, the origination address appears to be sent from the "" address.


Usage Considerations


  • When searching the archive, you must search for the address specified in the "New Address" field of the Address Alteration Definition. The search is unable to find the "Old Address".
  • As a cloud service, Mimecast cannot affect internal emails routed in the organization's infrastructure.
  • Address alteration policies should only be used if the address alterations are required to be applied to certain routes of traffic.
  • If the address alteration is specifically for the recipient address, the email address is rewritten with the message delivered to the new address only. 


What You'll Need



Creating a Policy


To create a policy, follow the instructions in the Creating / Changing a Policy article, but using the following options:


Policy NarrativeProvide a description for the Policy to allow you to easily identify it in the future.
Select Address Alteration Set

Use the Lookup button to select the required Address Alteration definition for the policy.


Definition required?




See also: