We run Exchange on-prem and Exchange Online, mail between mailboxes glitches
Hybrid mailflow uses connectors between on-prem and cloud. A wrong connector or certificate breaks routing between tenants.
support/email-aflevering/hybrid-mailflowsteps: 4
Try this first
- Re-run the Exchange Hybrid Configuration Wizard as a baseline
- Check certificate binding on the send connector
- Test mailflow with message trace between on-prem and cloud mailboxes
- Validate that accepted domains match on both sides
When to bring us in
Hybrid stays fragile. Finishing migration to pure cloud is usually the way out.
See also
- Our emails land in spam for some recipientsAlmost always an SPF, DKIM, or DMARC setting that is wrong or missing, or a sender name that mimics a well-known brand.
- Someone reports receiving phishing emails "from us"Read: spoofing. Someone is abusing your sender name, not necessarily your actual mailbox.
- An email bounces (NDR): delivery failedThe NDR text usually states the exact reason. Reading it is step one.
None of the above fits?
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