Get User Primary SMTP Address without Exchange module

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Have you ever found yourself in need to find user primary SMTP without having access to Exchange cmdlets? Usually checking the email built-in attribute is enough but there are situations where field is either empty or not properly aligned with user’s primary SMTP address.

Here’s a way to do it:

$testUser = Get-AdUser -Identity 'Test.User' -Properties 'ProxyAddresses'
[string]$primaryAddress = $testUser.'ProxyAddresses' -clike 'SMTP:*'

A user can only have a primary address denoted by the SMTP prefix. In the above example we are performing a case sensitive like operation on the ProxyAddresses attribute which will return only the primary address.

Of course the same approach can be used when dealing with multiple users

[array]$matchingUsers = Get-AdUser -Filter * -Properties 'ProxyAddresses'

foreach ($user in $matchingUsers)
  [string]$primaryAddress = $testUser.'ProxyAddresses' -clike 'SMTP:*'

  # Take any required action

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