Test-OutboundConnector.ps1

<#
    .SYNOPSIS

    This function tests all outbound connectors for centralized mail transport.

    .DESCRIPTION

    This function tests all outbound connectors for centralized mail transport.

    .EXAMPLE

    Test-OutboundConnector -overrideCentralizedMailTransportEnabled:$TRUE

    #>
    Function Test-OutboundConnector
     {
        [cmdletbinding()]

        Param
        (
            [Parameter(Mandatory = $true)]
            $overrideCentralizedMailTransportEnabled
        )

        #Output all parameters bound or unbound and their associated values.

        write-functionParameters -keyArray $MyInvocation.MyCommand.Parameters.Keys -parameterArray $PSBoundParameters -variableArray (Get-Variable -Scope Local -ErrorAction Ignore)

        #Define variables that will be utilzed in the function.

        [array]$exchangeOnlineOutboundConnectors=@()

        #Initiate the test.
        
        Out-LogFile -string "********************************************************************************"
        Out-LogFile -string "BEGIN Test-OutboundConnectors"
        Out-LogFile -string "********************************************************************************"

        $exchangeOnlineOutboundConnectors = get-o365OutboundConnector

        if ($overrideCentralizedMailTransportEnabled -eq $FALSE)
        {
            foreach ($outboundConnector in $exchangeOnlineOutboundConnectors)
            {
                if ($outboundConnector.RouteAllMessagesViaOnPremises -eq $TRUE)
                {
                    out-logfile -string "***WARNING***"
                    out-logfile -string "Centralized transport is enabled."
                    out-logfile -string "When centralized mail transport is enabled - if the migrated group contains any on premises mailboxes the public MX is utilized for routing."
                    out-logfile -string "If not properly tested this could lead to NDRs or messages appearing as external to on premises resources."
                    out-logfile -string "Migrating this DL can only be accomplished by acknowledging centralized mail transport is enabled using the -overrideCentralizedMailTransportEnabled:$TRUE"
                    out-logfile -string $outboundConnector.name
                    out-logfile -string $outboundConnector.RouteAllMessagesViaOnPremises
                    out-logfile -string "***WARNING***" -isError:$true
                }
                else 
                {
                    out-logfile -string "Connector not enabled for centralized mail transport."
                    out-logfile -string $outboundConnector.Name
                    out-logfile -string $outboundConnector.RouteAllMessagesViaOnPremises
                }
            }
        }
        else 
        {
            foreach ($outboundConnector in $exchangeOnlineOutboundConnectors)
            {
                if ($outboundConnector.RouteAllMessagesViaOnPremises -eq $TRUE)
                {
                    out-logfile -string "***WARNING***"
                    out-logfile -string "Centralized transport is enabled."
                    out-logfile -string "When centralized mail transport is enabled - if the migrated group contains any on premises mailboxes the public MX is utilized for routing if the message originated from on premises."
                    out-logfile -string "If not properly tested this could lead to NDRs or messages appearing as external to on premises resources."
                    out-logfile -string "The administrator has acknowledged the warning by overriding centralized mail transport enabled."
                    out-logfile -string $outboundConnector.name
                    out-logfile -string $outboundConnector.RouteAllMessagesViaOnPremises
                    out-logfile -string "***WARNING***"
                }
                else 
                {
                    out-logfile -string "Connector not enabled for centralized mail transport."
                    out-logfile -string $outboundConnector.Name
                    out-logfile -string $outboundConnector.RouteAllMessagesViaOnPremises
                }
            }
        }

        Out-LogFile -string "END Test-OutboundConnector"
        Out-LogFile -string "********************************************************************************"
    }