I bought MS Office v19 for Mac and upgraded to silicone chip.

Blocking targets one address, so spam continues when messages use changing or spoofed addresses. Outlook for Mac handles blocked senders differently by account type: Exchange and Outlook.com filtering is server-side, while other IMAP accounts depend on the provider’s junk controls. Mark messages as Junk or Report Phishing instead of only clicking Block, and configure filtering in the provider’s webmail so it applies before mail reaches the Mac. Create a rule only when a stable, trustworthy pattern exists in the headers or subject; avoid broad domain blocks that could hide legitimate mail. Do not reply or use unsubscribe links in suspicious messages. Office 2019 for Mac reached end of support and no longer receives security or bug fixes, so upgrade to a supported Outlook release before diagnosing client-specific behavior. If spam still bypasses server filtering, send message headers to the provider because Outlook cannot correct the provider’s filtering by itself.