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spf PROTOCOLHost: BIND / Named RFC Zone FileStandard: RFC 7208

How to Configure Sender Policy Framework (SPF) on BIND / Named RFC Zone File

Specifies which IP addresses and email service providers are authorized to send email on behalf of your domain. Follow this verified implementation guide to deploy standard compliant SPF DNS records in BIND / Named RFC Zone File.

Default SPF Record Syntax

// Authoritative RFC Example
v=spf1 include:_spf.example.com ~all

Configuration Steps in BIND / Named RFC Zone File

  1. 1Open the authoritative BIND zone file on your nameserver (/etc/bind/zones/db.domain).
  2. 2Locate the orphaned CNAME or NS entry.
  3. 3Comment out or delete the entire resource record line.
  4. 4Increment the SOA serial number (YYYYMMDDNN format).
  5. 5Execute `named-checkzone` to validate syntax and reload with `rndc reload`.

Verification Checklist (RFC 7208)

Extract TXT records on the root domain looking for "v=spf1".
Verify that there is strictly ONE SPF record (multiple records cause PermError).
Count total DNS lookups (RFC 7208 strictly limits recursive DNS evaluations to 10).
Ensure the record ends with "~all" (SoftFail) or "-all" (HardFail).
Live Validation Engine

Validate Your BIND / Named RFC Zone File SPF Record

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