Right now we have the inbound to our on premises Exchange server (hybrid - no mailboxes) set to 'All'. I need to use the ISD(s) to restrict to only MS. I have a Fortigate 100F with version 7. Anyone know which ones to use?
If not sure you can add all ISDBs starting with "Microsoft-". It will not harm.
As first step, keep the original policy (with All as source) below your new policy, until you ensure that the new policy matches all the required traffic, then you can delete it.
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