Metadata Preservation (Minutes) Policies

Document created by user.oxriBaJeN4 Employee on Sep 26, 2016Last modified by user.oxriBaJeN4 Employee on Mar 27, 2017
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An accepted message is not archived if it has a retention period of three days or less, but remains in the Accepted Email queue until it expires.

This functionality allows you to limit the life of message metadata to a value less than your company's maximum Account Retention. Email metadata (including the email header) is the associated information present in an email message. Metadata includes:

  • Date and time stamps
  • Mail server information
  • From / To addresses
  • Subject
  • Message-id


There are two different versions of the Metadata Preservation policies. The only difference between them is the time period length that can be applied to metadata.


Mimecast also retains additional metadata information, such as the policies applied to the message, delivery and rejection details, etc.

Although this is not commonly required, it is possible to remove the email metadata while preserving the contents of the email. Message retention can also be adjusted using Retention Adjustments.



This policy should only be used if you'd like to keep email metadata for a period shorter that the Maximum Account Retention setting.


What You'll Need


  • An Administrator Console logon with access to the Administration | Gateway | Policies menu item.


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.
Preservation Time (Minutes)

Specify the number of minutes, based on the sent date of the email, which determines the length of time that the metadata of the message is stored in the Archive. This Policy cannot override the maximum Account Retention period, and can only be used for a subset of users.


Definition Required?