Have you ever needed to send an email to all of the primary / last logged on / currently logged on user for every computer in a collection?  Here’s a nice little PowerShell script that can help you out with that.  Feel free to submit updates, issues, and requests in GitHub.

The latest code can be obtained from GitHub.  https://github.com/ChadSimmons/Scripts/blob/default/ConfigMgr/Document/Get-MECMDeviceCollectionPrimaryEmailAddresses.ps1

################################################################################
#.SYNOPSIS
#   Get-MECMDeviceCollectionPrimaryEmailAddresses.ps1
#   Get the Primary User and email for all computers in a ConfigMgr device collection
#.DESCRIPTION
#.PARAMETER SiteCode
#   Specifies the ConfigMgr Site Code
#.PARAMETER SiteServer
#   Specifies the ConfigMgr Primary Site Server
#.PARAMETER CollectionName
#   Specifies the name of the ConfigMgr device Collection
#.PARAMETER CollectionID
#   Specifies the ID of the ConfigMgr device Collection
#.PARAMETER OutputFile
#   Specifies the full path and file name of the CSV file receiving the script output
#.EXAMPLE
#   .\Get-MECMDeviceCollectionPrimaryEmailAddresses.ps1 -CollectionID USA001D9 -OutputFile U:\USA001D9.csv
#   Get the user information for a Collection ID and save the results to a CSV file

                             !!! one two skip a few 99 and now the end !!!

$PrimaryUsers | Format-Table -AutoSize

If ($OutputFile) {
	$PrimaryUsers | Export-Csv -Path "filesystem::$OutputFile" -NoTypeInformation
	Write-Output "Exported results to [$OutputFile]"
}

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Here is a sample output on screen and in CSV.