For that I came across this excellent Powershell script that does just that:
<# .DESCRIPTION Simple Powershell script that can bulk import remote IP ranges from a text file in a determined Exchange Receive Connector. The Import of the Remote IP ranges maintains the original values which are already present on the Selected Connector. .PARAMETERS None - execute directly from the Exchange Management Shell .Version 0.1 .Author Andy Grogan http://www.telnetport25.com .Compatibility Exchange 2007 Exchange 2010 Exchange 2013 .Release Date Jan 2013 #> function Select-FileDialog { param([string]$Title,[string]$Directory,[string]$Filter="Text Files (*.txt)|*.txt") [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms") | Out-Null $objForm = New-Object System.Windows.Forms.OpenFileDialog $objForm.InitialDirectory = $Directory $objForm.Filter = $Filter $objForm.Title = $Title $objForm.ShowHelp = $true $Show = $objForm.ShowDialog() if ($Show -eq "OK") { return $objForm.FileName } else { exit } } function get_RecConnector{ $RecConns = Get-ReceiveConnector | Select -ExpandProperty Identity $Count = 0; Write-Host "Bulk Import of Remote IP Addresses for Exchange Receive Connectors" -ForegroundColor Green Write-Host "Version 0.1" -ForegroundColor Green Write-Host "www.telnetport25.com" -ForegroundColor Green Write-Host "" Write-Host "Detected Receive Connectors: " -ForegroundColor Cyan Write-Host "" foreach($Connector in $RecConns){ Write-Host $Count "." $Connector -ForegroundColor White $Count ++ } Write-Host "" $Choice = Read-Host "Please select the Receive Connector that you wish to work with." Write-Host "" import_RemoteIPRanges $RecConns[$Choice] } function import_RemoteIPRanges{ param($ConnectorID) $FileName = Select-FileDialog "Open IP Range Text File..." $IPs = Get-Content $FileName foreach($IP in $IPs){ Write-Host "Adding IP Address :" $IP " to "$ConnectorID -ForegroundColor Cyan $Rcnn = Get-ReceiveConnector "$ConnectorID" $Rcnn.RemoteIPRanges += $IP Set-ReceiveConnector "$ConnectorID" -RemoteIPRanges $Rcnn.RemoteIPRanges } } get_RecConnector Write-Host "" Write-Host "Script Completed." -ForegroundColor Yellow
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