In a recent Reddit thread there was a question about message tracking and proxy addresses (or secondary email addresses).

A fairly common scenario for companies that have rebranded or merged with another company is a change of domain name for their email addresses. The typical approach is to roll out new email addresses for the new domain, most likely with an email address policy, and then leave the old email addresses as secondary addresses on the recipients so they can keep receiving email to them.

Eventually someone gets the idea that the old email addresses should be completely removed from all recipients. The question is put to the Exchange admin to work out whether anyone is still receiving email at their old email address.

Fortunately yes, message tracking does log this information. However it does not log it for the end to end mail flow. Here’s an example. This user has a primary email address of, and a secondary address of Let’s pretend that secondary address is on a different domain and we’ve been asked to look for any evidence that it is still being used.

Here’s what we would see in the results of a message tracking log search. Notice the RESOLVE event that resolves the recipient address to the primary email address. However, for the initial RECEIVE event the secondary address is visible.

[PS] C:>Get-MessageTrackingLog -Recipients -Start (Get-Date).AddHours(-1) | sort timestamp

EventId  Source   Sender                            Recipients                        MessageSubject
-------  ------   ------                            ----------                        --------------
HARED... SMTP                     {}
RECEIVE  SMTP                     {}
RESOLVE  ROUTING                     {Alex.Heyne@exchangeserverpro....
AGENT... AGENT                     {Alex.Heyne@exchangeserverpro....
SEND     SMTP                     {Alex.Heyne@exchangeserverpro....
DELIVER  STORE...                     {Alex.Heyne@exchangeserverpro....

So the answer to the question is yes, message tracking logs will show usage of secondary email addresses and can be used to investigate whether those addresses are being used. You may need to run different searches depending on the specifics of your scenario. If you’re new to message tracking I recommend you start here.

About the Author

Paul Cunningham

Paul is a former Microsoft MVP for Office Apps and Services. He works as a consultant, writer, and trainer specializing in Office 365 and Exchange Server. Paul no longer writes for


  1. Emma

    Yes. Social media is one of the most powerful marketing tools today. It is for this reason that brands focus most of their efforts on promoting their products and services on social platforms. Over the past few years, many auxiliary tools have appeared, but it is also important to choose the right proxy service for your needs. Once upon a time, smart dns proxy review helped me a lot.

  2. Grant Jestadt

    Unfortunately, I cannot get this to work in Exchange 2013 CU15. It only shows the primary email address for all EventID’s. Have you given this a try lately on Exchange 2013\2016.


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