extract Acceptmessagesfrom members list of a DL

It is important to note that there are two fields that contain 'accept from' information for a Distribution Group.

• "AcceptMessagesOnlyFrom"
• "AcceptMessagesOnlyFromDLMembers"

"AcceptMessagesOnlyFrom" contains mailboxes only

"AcceptMessagesOnlyFromDLMembers" may contain mailboxes as well as Distribution Groups

You can start with the code below which will simply display results and work from there to customize to your needs.

$Dl = get-distributiongroup "some DL you know contains restrictions"

$OnlyFrom = $Dl.AcceptMessagesOnlyFrom

$OnlyMembers = $Dl.AcceptMessagesOnlyFromDLMembers

Write-host "AcceptMessagesOnlyFrom:" -foregroundcolor Red

foreach ($User in $onlyFrom) {

   $mbx = Get-mailbox $User

   write-host $mbx.primarysmtpaddress -foregroundcolor green

}

Write-host "AcceptMessagesOnlyFromDLMembers:" -foregroundcolor Red

ForEach ($Obj in $OnlyMembers) {

   $MB = get-mailbox $Obj -erroraction silentlycontinue

   $NewDL = get-distributiongroup $Obj -erroraction silentlycontinue

   if ($NewDL -NotLike $null) {

      write-host $NewDL.primarysmtpaddress -foregroundcolor green

   } Else {

      write-host $MB.primarysmtpaddress -foregroundcolor Yellow

   }

}