OutlookMainfestRuleForExternalInSubject

            <!-- Rules-based detected entity for right click on spam -->
            <ExtensionPoint xsi:type="DetectedEntity">
              <Label resid="sendSpamButtonLabel" />
              <SourceLocation resid="sendSpamTaskPaneUrl" />
              <Rule xsi:type="RuleCollection" Mode="And">
                <Rule xsi:type="ItemIs" ItemType="Message" Highlight="All" />
                <Rule xsi:type="ItemHasRegularExpressionMatch" RegExName="subjectWithExternal" RegExValue="(\[EXTERNAL\])" PropertyName="Subject" Highlight="All" />
                <Rule xsi:type="ItemHasRegularExpressionMatch" RegExName="allText" RegExValue=".*" PropertyName="BodyAsPlaintext" Highlight="All" />
              </Rule>
            </ExtensionPoint>