The curious case of seemingly random SPF failures in an Exchange Hybrid

Or "How I found out about - Tenant Attribution - and what the heck it is..." An email gets send from our on-premises environment (or comes to our on-premises via the hybrid servers...). Since we're using mail gateways, Exchange routes this message to the mail gateways living in the DMZ The mail gateways do their DNS lookup, see that the mail should be routed to EOP, and establish a connection to deliver the mail (TLS secured, since this is enabled on the mail gateways!) EOP receives the message, goes throught its rule list and delivers the message to Exchange Online Exchange Online delivers the message to the intended recipient...

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Troubleshooting the information store service

A lot of calls I get are related to the information store service of the exchange server not starting. Since troubleshooting why this services does not start is often related to alot of stress (after all, your users and managers will be pounding your door as they cannot access their email) it is always handy to have some reference as to where you can start and what direction it can take.

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