• Go to Start > Run and type adsiedit.msc
  • Now, find the unit where your AD user’s reside
  • Right click the user you want to edit and click Properties.
  • Find the variable proxyAddresses – this is the one you want to edit. When you add new e-mail aliases, you want to make sure that your primary e-mail address will start with upper-case SMTP. Your aliases, aka, secondary addresses should be lower-case smtp.

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