This PowerShell script automates the deletion of distribution lists from Exchange Online or on-premises Exchange using a CSV file as input.

• CSV-based bulk deletion of distribution lists
• Automatic column detection - supports Identity, EmailAddress, DisplayName, etc.
• Comprehensive logging with timestamped log files
• WhatIf mode for testing before actual deletion
• Error handling with detailed error messages
• Results export - creates a CSV report of all operations
• Progress tracking with counters and status updates
• Color-coded console output for easy monitoring

# Install the Exchange Online Management module
Install-Module -Name ExchangeOnlineManagement

# Connect to Exchange Online
Connect-ExchangeOnline -UserPrincipalName admin@yourdomain.com

# Add Exchange Management Shell snap-in
Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn

The CSV file should contain at least one of the following columns:

• Identity (recommended)
• EmailAddress
• Email
• PrimarySmtpAddress
• DisplayName
• Name

Identity
[email protected]
[email protected]
[email protected]

Or with multiple columns:

Identity,DisplayName
[email protected],Sales Team
[email protected],Marketing Distribution List

.\Delete-DistributionListsFromCSV.ps1 -CsvFilePath "C:\Lists\DistributionLists.csv"

.\Delete-DistributionListsFromCSV.ps1 -CsvFilePath "C:\Lists\DistributionLists.csv" -WhatIf

.\Delete-DistributionListsFromCSV.ps1 -CsvFilePath "C:\Lists\DistributionLists.csv" -LogPath "C:\Logs\MyLog.log"

The script generates two output files:

1. Log File: DeleteDL_YYYYMMDD_HHMMSS.log

   • Contains detailed timestamped logs of all operations
   • Includes success, failure, and error messages

2. Results CSV: DistributionLists_Results_YYYYMMDD_HHMMSS.csv

   • Contains a record of each distribution list processed
   • Includes status (Success/Failed/Skipped) and messages

1. Export existing distribution lists (optional):

   Get-DistributionGroup | Select-Object Identity,DisplayName,PrimarySmtpAddress | Export-Csv -Path "AllDLs.csv" -NoTypeInformation

2. Edit CSV to include only the distribution lists you want to delete

3. Test with WhatIf:

   .\Delete-DistributionListsFromCSV.ps1 -CsvFilePath "AllDLs.csv" -WhatIf

4. Execute deletion:

   .\Delete-DistributionListsFromCSV.ps1 -CsvFilePath "AllDLs.csv"

5. Review results in the generated log and results CSV files

The script handles various scenarios:

• Missing Exchange connection: Prompts to connect
• Empty CSV: Validates file has content
• Invalid identifiers: Logs and continues with next entry
• Non-existent distribution lists: Logs error and continues
• Throttling: Includes small delays between operations

• WhatIf support: Test before executing
• Confirmation bypass: Uses -Confirm:$false only in actual deletion
• Detailed logging: Every action is logged
• Results tracking: Creates comprehensive report of all operations

• Ensure you're connected to Exchange Online or on-premises Exchange
• Run Connect-ExchangeOnline or add the Exchange snap-in

• Check your CSV has one of the supported column names
• Rename your column to Identity for best compatibility

• Ensure your account has permissions to delete distribution lists
• Typically requires "Organization Management" or "Recipient Management" role

• v1.0 - Initial release with CSV-based bulk deletion functionality

MIT License - Free to use and modify