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Add Secondary Email Address for Existing Distribution Group

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Add Secondary Email address for existing distribution group. Do not remove existing emails.

Code Used

$list = Import-Csv "C:\InputFile.csv"
foreach($item in $list)
{
    $Name =""
    $ExternalAddress =""
    $Name =$item.Name
    $ExternalAddress =$item.ExternalAddress
    Set-Distributiongroup $Name -EmailAddresses @{add=$ExternalAddress} -confirm:$false
    Get-Distributiongroup $Name | fl EmailAddresses
    Write-Host "Secondary EmailAddress $ExternalAddress added"

}

Error

Cannot process argument transformation on parameter 'EmailAddresses'. Cannot convert value "System.Collections.Hashtable" to type "Microsoft.Exchange.Data.ProxyAddressCollection". Error: "MultiValuedProperty collections cannot contain null values.Parameter name: item" + CategoryInfo : InvalidData: (:) [Set-DistributionGroup], ParameterBindin...mationException + FullyQualifiedErrorId : ParameterArgumentTransformationError,Set-DistributionGroup

Summary

There are many ways of doing it. The version of PowerShell used in Version 2.0. That's not an issue here. Looking into the error message the code is passing NULL values. So it's bettter to check the Input file.

Fix

The input file used is a manually created CSV file using Notepad. System.Collections.Hashtable. So the header is Name and Value. Simply fix the input file and execute the below code:

 Import-Csv "C:\InputFile.csv" | 
 %{Set-DistributionGroup $_.name -EmailAddresses @{add= $_.externaladdress -Confirm:$false -Force }}

Enjoy PowerShell :)