Migrating from Google Postini

Document created by user.oxriBaJeN4 Employee on Sep 18, 2015Last modified by user.oxriBaJeN4 Employee on Aug 12, 2016
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The table below outlines the main configuration objects requiring evaluation when migrating from Google Postini to Mimecast. It is important to note that there may case by case variations for individual customers.


For more information on Google Apps migration, view the last topic in this article.


Email Processing


Spam FilteringConfiguring Spam Scanning Definitions and Policies

Virus Blocking

Configured by default, with monitoring through: Monitoring Message Flow

Admin Blocked Sender listConfiguring Blocked Senders Policies
Admin Approved Sender list, IP Block RuleConfiguring Permitted Senders Policies, Configuring Auto Allow Policies
Org Senders ListsManaging an End User's Managed Senders List, Configuring Permitted Senders Policies, Configuring Blocked Senders Policies
Attachment ManagerConfiguring Attachment Management Definitions and Policies, Configuring Attachment Link on Size Policies
Content Manager and Outbound FilteringContent Examination Policies
TLS controls (Inbound and Outbound Servers)Configuring Secure Receipt Policies, Configuring Secure Delivery Definitions and Policies
Admin Quarantine and Quarantine SummaryMonitoring Message Flow
Message CenterPersonal Hold Queue, available through multiple The specified item was not found.
Message LimitsProvide input to Mimecast Support team
Delivery manager, Connections MgrConfiguring Delivery Routing Definitions and Policies, monitored through Monitoring Message Flow
NotificationsConfiguring Digest Sets Definitions and Policies, Configuring Notification Sets Definitions and Policies
Outbound ServersProvide input to Mimecast Support team


Account Security


Organization Policy ManagementYour Mimecast Account Settings for the organization, and Configuring Application Settings for user apps
Delegate Administration and Restrict searchesUnderstanding Administrator Roles
Directory SyncDirectory Synchronization
N/AService failure alerts for Administrators through The Service Monitor
Password PoliciesYour Mimecast Account Settings





Compliance Footer


Stationery Overview
Log SearchAdministration Console: Audit Logs
General SettingsYour Mimecast Account Settings


Archive Search



Archived email search

Advanced Boolean search

Message summaries

Detailed Message display

Attachment viewing

Archive Administration and Monitoring Message Flow

Identity lookup and search

Investigation management

Archive reports

Transfer ownership of saved searches or investigations

eDiscovery Cases and Mimecast Personal Portal: Smart Tags
Investigation summary pagesArchive Administration 'Search and 'View Logs', and eDiscovery Cases Logs
User Holds, Place a hold on saved search resultsLitigation Holds
Personal ArchiveAvailable through multiple The specified item was not found.
UndeleteNot applicable
Export saved resultsExporting / Collecting Data
OU based retentionConfiguring Content Preservation (Days / Minutes) Policies , Configuring Metadata Preservation (Days / Minutes) Policies


Google Apps


Mimecast provides dedicated hosts for Inbound, Outbound and Journal communication, which will support Google Apps. Google Apps does not have a Journaling feature, but all messages exchanged internally are delivered via the mail gateway / smart host that has been set up automatically.


See the Using a Google App with Mimecast page for further details.

For continuity, Mimecast Mobile or Mimecast Personal Portal will have to be used. Mimecast Synchronization Engine is not supported.