Add_SMTP_365_Proxy_Email.ps1

#Variables 

$Domain = "accentconsultingservices.mail.onmicrosoft.com" 

  

#Get all users in ActiveDirectory 

$Users = Get-ADUser -Filter * -Properties ProxyAddresses 

  

#Some output is always nice 

Write-Host "Processing $Users.Count users..." -ForegroundColor Green 

  

#Go through all users 

foreach ($User in $Users) { 

  

#Check if <domain>.mail.onmicrosoft.com alias is present, if not add it as an alias 

if ($User.Proxyaddresses -like "*$Domain*") { 

Write-Host "$User.SamAccountName has an alias matching $Domain..." -ForegroundColor Yellow  

} 

else { 

$Alias = "smtp:" + $User.SamAccountName + "@" + $Domain 

Set-ADUser $User -Add @{Proxyaddresses="$Alias"} 

Write-Host "Alias addded to $User.SamAccountName..." -ForegroundColor Green 

} 

} 

Write-Host "Done" -ForegroundColor Green