Hybrid Exchange Architecture: On-Prem to Cloud Mail Flow

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337. #ExchangeOnline #HybridExchange #OnPremExchange #EmailArchitecture #M365 #SendConnectors #TransportRules #MailFlow #CloudFirst #ITSecurityCrucial Hybrid Exchange The “hybrid” mode is like a very tight Spanner: on‑prem transport flows into the cloud, and the cloud can route back to on‑prem. Standard hybrid uses a hybrid wizard that provisions a shared mailbox functionality (global address list, free‑/busy calendars, etc.) while keeping mail flow via an edge‑clean configuration. Transport behaves like this: mail sent from on‑prem by the on‑prem sender passes through a send‑connector that points to the on‑prem Edge or M365 tunnel; mail destined for the external world hits the Exchange Online Send Connector, which deals with SPF/DKIM/DMARC as usual. Security layers stack: on‑prem anti‑spam/anti‑virus filters get processed before the outgoing message hits the cloud‑based ATP or Defender for Office 365. Best practice: keep the “hybrid” mode up‑to‑date with the Microsoft Exchange Hybrid Configuration Wizard (HCW) and use shared transport rules only for compliance reasons – the more rules the more latency.

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