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One Email Header Reliably Blocks Out-of-Office Replies — But Only on Microsoft 365

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A developer discovered that transactional emails — such as password resets and receipts — were silently triggering out-of-office auto-replies that flooded a support queue with empty tickets. Investigating the problem revealed that only one email header, X-Auto-Response-Suppress, has documented and enforced suppression behavior, and it works exclusively within Microsoft 365 and Exchange environments. Other commonly used headers like Precedence: bulk and Auto-Submitted: auto-generated are best-effort signals that mail servers may honor or ignore without any published guarantee. Unlike spam or bounces, auto-replies pass SPF and DKIM checks and bypass bounce handlers, making them difficult to filter after the fact. The recommended fix is to set suppression headers on the sending side rather than building filters to parse and discard auto-reply content after it arrives.

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