Configuring Local Mailbox Policies

Document created by user.oxriBaJeN4 Employee on Oct 2, 2015Last modified by user.oxriBaJeN4 Employee on Oct 9, 2017
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A Local Mailbox policy is used by an active Continuity Event. This policy is only visible if you have a continuity subscription, or your account has been setup with the Hermes webmail utility. With a policy configured and a continuity event is active, messages are not routed through Mimecast. Instead they are forwarded to a local mailbox. This enables users of Mimecast end user applications to access their messages during the event using a webmail utility.


You can implement the policy to alter the destination address for a particular mail flow. The forwarding address must be a valid internal or external email address. Any policy match overrides the default delivery route. We determine whether the forwarding address is internal or external, and deliver the message to this address. Details regarding the original recipient and the forwarded recipient are included in the email headers, which can be accessed using an Archive Search.

Forwarded messages are still processed by our security systems, including content, spam and virus checks. The message contents are also archived according to your account retention period.

Usage Considerations

Consider the following before creating a policy:

  • If a Local Mailbox Bypass Policy is active, they won't be available during a continuity event. They also can't be downloaded using Post Office Protocol (POP). Instead of “Local Mailbox” you could read “Continuity Mailbox”, except that it also allows items to be downloaded by POP. If the client has a POP Only domain this doesn’t apply.


Configuring a Local Mailbox Policy

To configure a Local Address policy:

  1. Log on to the Administration Console.
  2. Click on the Administration menu item. A menu drop down is displayed.
  3. Click on the Gateway | Policies menu item. 
  4. Click on Local Mailbox. A list of policies is displayed.
  5. Either select the:
    • Policy to be changed.
    • New Policy button to create a policy.
  6. Complete the Options section as required:
    Policy NarrativeProvide a description for the policy to allow you to easily identify it in the future.
    Select OptionSpecify whether to enable your local mailbox or to take no action.
    We require this policy to be enabled for continuity event purposes. If you want to exclude certain messages from being available during a continuity event, select the "Take no action" option, or use a Local Mailbox Bypass Policy.
  7. Complete the Emails From and Emails To sections as required:
    Field / OptionDescription
    Addresses Based OnSpecify the email address characteristics the policy is based on. This option is only available in the "Emails From" section. The options are:
    The Return Address (Mail Envelope From)This default setting applies the policy to the SMTP address match, based on the message's envelope or true address (i.e. the address used during SMTP transmission).
    The Message From Address (Message Header From)Applies the policy based on the masked address used in the message's header.
    BothApplies the policy based on the Mail Envelope From or the Message Header From whichever matches. If both match the specified value, the Message Header From is used.
    Applies From / ToSpecify the Sender characteristics the policy is based on. For multiple policies, you should apply them from the most to least specific. The options are:
    EveryoneIncludes all email users (i.e. internal and external). This option is only available in the "Emails From" section.
    Internal AddressIncludes only internal organization addresses.
    External AddressIncludes only external organization addresses. This option is only available in the "Emails From" section.
    Email DomainEnables you to specify a domain name to which this policy is applied. The domain name is entered in the Specifically field.
    Address GroupsEnables you to specify a directory or local group. If this option is selected, click on the Lookup button to select a group from the Profile Group field. Once a group has been selected, you can click on the Show Location field to display the group's path.
    Address AttributesEnables you to specify a predefined Attribute. The attribute is selected from the Where Attribute drop down list. Once the Attribute is specified, an attribute value must be entered in the Is Equal To field. This can only be used if attributes have been configured for user accounts.
    Individual Email AddressEnables you to specify an SMTP address. The email address is entered in the Specifically field.
  8. Complete the Validity section as required:
    Field / OptionDescription
    Enable / DisableUse this to enable (default) or disable a policy. If a date range has been specified, the policy will automatically be disabled when the end of the configured date range is reached.
    Set Policy as PerpetualIf the policy's date range has no end date, this field displays "Always On" meaning that the policy never expires.
    Date RangeUse this field to specify a start and / or end date for the policy. If the Eternal option are selected, no date is required.
    Policy OverrideThis overrides the default order that policies are applied. If there are multiple applicable policies, this policy is applied first unless more specific policies of the same type are configured with an override.
    Bi-DirectionalIf selected the policy is applied when the policy's recipient is the sender, and the sender is the recipient.
    Source IP Ranges (n.n.n.n/x)Enter any required Source IP Ranges for the policy. These only apply if the source IP address used to transmit the message data, falls inside or matches the range(s) configured. IP ranges should be entered in CIDR notation.
  9. Click on the Save and Exit button.


See Also...