Assuming you have a single domain, there should be a group in Active Directory called “Exchange Servers”. The members of this group contains all the servers for the Exchange Organization. Please note that a member of that group could also be a group (what we call nested-group-member). Using the ActiveDirectory powershell module it is easy to list the member of the group:
(If you don’t have the Remote Server Administration Tools (RSAT) installed, you can run this command to install them:
Get-WindowsFeature -Name RSAT | Add-WindowsFeature -IncludeAllSubFeature
PS D:\PowerShell> Get-ADGroup -Identity “Exchange Servers” |Get-ADGroupMember | Format-Table -AutoSize
distinguishedName name objectClass
CN=Exchange1,OU=Exchange servers,OU=Servers,DC=contoso,DC=com Exchange1 computer
CN=Exchange2,OU=Exchange servers,OU=Servers,DC=contoso,DC=com Exchange2 computer
CN=Exchange Install Domain Servers,CN=Microsoft Exchange System Objects,DC=contoso,DC=no Exchange Install Domain Servers group
ObjectClass gives you the object type (computer/group).
Hope this helps.