What's new for transport rules
Applies to: Exchange Online, Exchange Server 2013
Topic Last Modified: 2014-10-03
In Microsoft Exchange Server 2013, several improvements have been made to transport rules. This topic provides a brief overview of some of the key changes and enhancements. To learn more about transport rules, see Mail flow or transport rules.
Data loss prevention (DLP) features in Exchange 2013 can help organizations reduce unintentional disclosure of sensitive data. Transport rules have been updated to support creating rules that accompany and enforce DLP policies. To learn more about DLP support in transport rules, see the following topics:
The functionality of transport rules has been extended via the addition of new predicates and actions. Each predicate listed below can be used as a condition or an exception when you're creating transport rules.
Support for extended regular expression syntax Transport rules in Exchange 2013 are based on the Microsoft.NET Framework regular expression (regex) functionality and now support extended regular expression syntax.
Transport rules agent invocation The key architectural change in Exchange 2013 for Transport rules is the Transport Rules Agent is invoked on onResolvedMessage. In previous versions of Exchange, the Rules Agent was invoked on onRoutedMessage. This change allowed us to add new actions, such as requiring TLS, which can change how a message is routed. To learn more about the transport rules architecture in Exchange 2013, see Mail flow or transport rules.
Detailed Transport rule information in message tracking logs Detailed information about Transport rules is now included in message tracking logs. The information includes which rules were triggered for a specific message and the actions taken as a result of processing those rules.
New rule monitoring functionality Exchange 2013 monitors Transport rules that are configured and measures the cost of running these rules both when you're creating the rule and also during regular operation. Exchange can detect and generate alerts for rules that are causing delays in mail delivery.