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HTTP & email codes

Filter HTTP response codes (RFC 9110 family), SMTP server reply codes (RFC 5321), and extended delivery status notifications (RFC 3463). Three tabs; type to narrow the list.

About these lists

HTTP status codes are summarized for typical use; always refer to the latest HTTP semantics RFC and IANA registry for authoritative details. SMTP three-digit codes come from the server’s text after the digit; wording varies by implementation. DSN extended statuses appear in bounce messages and help classify delivery failures (e.g. 5.1.1 user unknown).