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Arcjet · Concept

INVALID

INVALID is an email category for addresses with invalid syntax. Add it to an email deny list to reject such signup attempts.

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Syntax

protectSignup({ email?: EmailOptions, bots?: BotOptions, rateLimit?: SlidingWindowRateLimitOptions })

In-depth API docs are only for subscribers: parameters, examples, common mistakes and interview practice.

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  • protectSignup
  • email validation
  • bot protection
  • rate limiting
  • DRY_RUN
  • LIVE
  • NO_MX_RECORDS
  • DISPOSABLE

Source: Signup form protection reference for Next.js | Arcjet Docs. Checked 2026-11-03.