{"success":true,"data":{"id":"from-display-name-only-digits","label":"From display name is only digits / punctuation — spam fingerprint","description":"The From header's display name contains only digits / punctuation / whitespace — no letters at all. Spam pattern: `From: \"12345\" <x@y.z>` or fake phone-number displays like `\"888-777-6666\" <support@random>`. Spammers use numeric display names to evade keyword-based display-name filters and to impersonate SMS short codes or corporate support lines. Legitimate senders always have at least one letter in their display name — company names, personal names, and brand names in every language all contain letters (including CJK, Cyrillic, Arabic, etc. which count as letters under Unicode `\\p{L}`). A purely numeric display name is either a misconfigured mailer (rare) or a spammer.","tier":"warning","category":"sender","isThin":false}}