Apparently ExchangeOnline is not adding the X-MS-Exchange-CrossTenant-* headers any more. Lots of fun if you have tools in your outbound mail flow that interact with multiple MS365 tenants and separates them based on the X-MS-Exchange-CrossTenant-id header (amongst other use cases).
So far we’ve seen it with customers hosted in the german MS365 cloud, but not with customers in the swiss cloud. Any other observations? — Matthias -- Matthias Leisi Katzenrütistrasse 68, 8153 Rümlang Mobile +41 79 377 04 43 matth...@leisi.net
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