We have added a former employees email address as an alias in the manager's list of email addresses. The former employees Exchange account has since been deleted. How can we create a server based rule (Exch2013) that tags the subject line with the phrase "Fowarded" on messages that are sent to the former emps address? Currently the To: information is lost once the message is delivered to the manager's inbox. We don't want to keep the Exchange accounts for former employees past a certain timeframe so we simply add their address as an alias instead.
We have tried "If the message includes these words in the recipient's address 'email@example.com" do the following: "Prepend the subject with 'Text goes here'", Rule mode is Enforce and additional properties: "Sender address matches: Header". Doesn't work. We have also tried if the message header contains 'firstname.lastname@example.org' do the same, but this also doesn't work.
Any suggestions would be appreciated. Remember the recipient (former emp) is no longer available to pick from when using "Apply this rule if the recipient" "is this person".