MX Record Analyzer
Parse pasted DNS MX records, sort their preferences, and identify a correctly formed Null MX record without performing DNS lookups.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
Analysis
| Preference | Exchange | Status |
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How it works
Paste MX RDATA (for example, `10 mail.example.`) or ordinary zone-file lines. Lower preference values are tried first; equal values remain in input order. A Null MX is exactly one MX record with preference 0 and exchange `.` (RFC 7505). Exchanges must be host names (letter-digit-hyphen labels per RFC 952 / RFC 1123, and an all-numeric highest-level label is rejected); `xn--` labels pass through as LDH labels without IDNA validation, and a name without a trailing dot is treated as absolute unless it is a single label. This tool only examines pasted text: it does not look up DNS or determine mail delivery.