Apply this rule if:
Includes these words in the sender’s address: ‘onmicrosoft.com’
and Is received from ‘Outside the organization’

Except if:
‘Content-ID’ header contains ”bookings_reminder’ or ‘bookings_teams”
or Includes these words in the sender’s address: ‘postmaster’ or ‘.onmicrosoft.com’
or sender’s address domain portion belongs to any of these domains: ‘.onmicrosoft.com’
or Includes these words in the message subject or body: ‘onmicrosoft.com/bookings/’ or ‘Microsoft Bookings’
or ‘Content-Type’ header matches the following patterns: ‘text/plain; name=booking.ics’ or ‘method=CANCEL’ or ‘method=REQUEST’

Hello, John! It`s not working for me, can you please explain bit more? Only Header with anything related to Bookings is ” X-MS-TrafficTypeDiagnostic” containing example value of: “…6105:EE_BookingsEmail|DB1P…”. Creating rule with exception, based on this header is not working for me.

Apply if the address in the message matches the pattern onmicrosoft.com unless it comes from your own domain or any other onmicrosoft.com domains known as good senders.

Thanks John!

Whoops, looks like the Commenting engine filtered out the header value in my previous comment. The value is “bookings_reminder” surrounded by pointy-brackets.