Public/Spamfilter/Get-SpamfilterDomainDestination.ps1

function Get-SpamfilterDomainDestination {
    Param(
        [Parameter(Mandatory)]
        [string]$DomainName
    )
    process {
        try {
            $Credential = Get-SpamFilterCredential
        }
        catch {
            throw "Failed to retreive Spamfilter credential: $_"
        }

        try {
            $DomainName = [System.Web.HttpUtility]::UrlEncode($DomainName)
            $Destinations = Invoke-WebRequest -Credential $Credential -Uri "$($SpamfilterAPIBaseURL)/domain/getroute/domain/$($DomainName)/" | ConvertFrom-Json
        }
        catch {
            throw "Failed to retreive destinations from Spamfilter: $_"
        }
        $Destinations
    }
}