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SPF Parser

Record Analysis & Validation
SPF Record
Examples:
SPF Lookup Limit: SPF records are limited to 10 DNS lookups. Mechanisms that trigger lookups: include, a, mx, ptr, exists, and redirect.
SPF Mechanism Reference
include:domain

Include another domain's SPF (DNS lookup)

ip4:address/prefix

Authorize IPv4 address or range

ip6:address/prefix

Authorize IPv6 address or range

a[:domain]

Authorize A records (DNS lookup)

mx[:domain]

Authorize MX records (DNS lookup)

all

Match everything (usually last)

exists:domain

Check if domain resolves (DNS lookup)

redirect=domain

Use another domain's SPF instead

Qualifiers
+ Pass (default) - Fail (reject) ~ SoftFail (accept but mark) ? Neutral (no policy)