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Features not included

Postini (GMS) features that are no longer relevant

In Google, we've updated or completely redesigned many of Postini's (Google Message Security / GMS) email security features.

Some Postini features will not be moved into Google email security because they are no longer relevant:

  • Email proxy - Postini relied on an SMTP proxy, where all transmissions between sender and receiver were relayed through the proxy. The new service processes messages in the Google network before sending valid mail onward. This offers the advantage of lower connection overhead as Gmail sends only valid messages to the customers' server.
  • Wireless settings - Wireless settings allow users to forward messages to an SMS number. The feature was developed before smart phones were widely available and now serves little purpose.
  • Spooling - When your on-premise mail service is unavailable, Postini can spool mail for later delivery. This is no longer needed for customers who switch to Gmail. For on-premise mail servers, Gmail will retry messages.
  • Password configuration policies - Google supports two-factor authentication. Customers with stringent policies can implement single sign-on (SSO) and whatever on-premise policy enforcement they choose.
  • Blatant spam controls - Gmail automatically rejects blatant spam at a similar rate as Postini.
  • Per user settings (spam thresholds, Approved Senders / Blocked Senders) - Approved senders lists from Postini are injected into the Gmail user account. Gmail also automatically learns from users marking and unmarking messages as spam and customizes filtering accordingly. For instance, when users add their contacts to Gmail, messages from these senders will also get more lenient spam filtering. This is simpler, more intuitive, and more reliable than managing approved senders manually in a separate interface.
  • Specific SPF, DKIM and IPLock policies - These tools require complex management by the customer and are most useful to get around Postini's limitation on Approved Sender Lists, or a particular sender's lack of adoption of industry-standard SPF or DKIM authentication methods. Gmail Approved Sender Lists automatically take into account mail authentication by default.
  • Admin and end user spam sensitivity and category controls - These have limited effectiveness in the modern spam environment and can raise false positive rates.
  • Black hole disposition - Black hole disposition is a violation of the SMTP specification. With poorly-written filters that generate false positives, black holes provide no recourse to the sender. There is also little evidence to suggest spammers glean any intelligence from seeing rejections.
  • Industry heuristics - Industry heuristics were developed in an earlier era of the spam threat environment. The rules were used to provide preferential treatment for legal and financial services senders but over time have resulted in increased false positives.

Postini (GMS) features not supported in Google

Some Postini features will not be rebuilt in Google:

  • Mail server connection limits - This was important with Postini's email proxy architecture because Postini connected to the customer mail server with every spam message. Now, Gmail delivers only clean mail to the on-premise system.
  • Content Manager, Outbound activity log - This feature has a limit of 5000 entries. As a result, it provides limited visibility to corporate compliance to content policies.
  • Quarantine summary branding - This feature was not widely adopted by Postini customers. Google provides some branding customization in the web interfaces of the various tools.
  • Administrator access to end user quarantines - This will not be available in the Google platform.

Note: The Quarantine Summary is available only for customers using on-premise mail systems.


Postini (GMD) functionality not included in Vault

SePostini features not included with Vault in Get started: Postini customers for more information.