Outlook Spam Filter Not Working: What to Do About It

Outlook’s spam-filter problems reported in early 2023 led to legitimate messages being sent to junk folders, spam reaching inboxes, and inconsistent email categorization, potentially due to service issues, user settings, learned behavior, or sender-side deliverability problems. Bulk senders can reduce filtering risks by correctly configuring SPF, DKIM, and DMARC authentication, monitoring domain and IP reputation, checking blocklists and complaint data, testing messages before deployment, maintaining clean subscriber lists, and improving engagement through relevant, segmented content. Everyday Outlook users can adjust Junk Email Options, consistently use the Not Junk command for misclassified messages, and manage Safe Senders and Blocked Senders lists, while senders should avoid asking recipients to safelist them unless specifically requested.

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