Added Files

Powershell/PowerShell-Office365Admin/ExchangeWithAADConnect/GetMailboxesBasedOnPrimarySMTP.ps1

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+# Find mailboxes using a specific email domain and export list to CSV file
+#
+
+# What is the FQDN of the on-prem Exchange server?
+$exchangeServerFQDN = ''
+
+# Primary SMTP domain to search for
+$primarySMTP = ''
+
+# Where are we saving the output file?
+$outputFile = 'C:\Temp\Mailboxes.csv'
+
+# Create Exchange connection Uri from FQDN
+$exchangeConnectionUri = 'http://' + $exchangeServerFQDN +'/PowerShell/'
+
+# Establish a session to Exchange
+$userCredential = Get-Credential
+$session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri $exchangeConnectionUri -Authentication Kerberos -Credential $userCredential
+Import-PSSession $session -DisableNameChecking
+
+# Get list of mailboxes
+$allMailboxes = Get-RemoteMailbox -ResultSize Unlimited | Where-Object {($_.PrimarySmtpAddress.Split('@')[1] -eq $primarySMTP)}
+
+# Export results to CSV file
+$allMailboxes | Select-Object Name,Alias,UserPrincipalName,PrimarySmtpAddress,EmailAddresses | Export-Csv -Path $outputFile -NoTypeInformation
+
+# End the Exchange Session
+Remove-PSSession -Session $session