# Microsoft reports ASCII-smuggling use in email spam

_Saturday, September 5, 2026 at 2:05 AM EDT · Security, AI · Latest · Tier 2 — Notable_

Microsoft said email spammers are adopting ASCII smuggling, a technique used to conceal malicious instructions in AI-agent prompt-injection attacks, to evade email-platform filters. The reported shift applies the obfuscation technique to spam rather than only AI-agent attacks. Microsoft identifies filter evasion as the operational use, but the supplied account does not describe the campaign's scale or name affected email platforms.

## Sources

- [Techmeme](https://www.techmeme.com/260905/p4#a260905p4)

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Canonical: https://techandbusiness.org/newswire/vp9t9xA9H-OzdbGs_LUuN2
Retrieved: 2026-09-05T09:04:46.757Z
Publisher: Tech & Business (techandbusiness.org)