DKIM Inspector

A DKIM diagnostic tool that inspects DKIM records.

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Error

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Public key length

Notes

Warnings / Errors

Details

Tag

Name

Value

Default

None

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Tag	Name	Default	Translation
v	Version	DKIM1	Version of the DKIM key record (plain-text; RECOMMENDED). This tag MUST be the first tag in the record if present. Warning: some ISPs may mark the DKIM authentication check as neutral if the version tag is invalid.
h	Hash algorithms	* (allow all)	Acceptable hash algorithms (plain-text; OPTIONAL). A colon-separated list of hash algorithms that might be used. Unrecognized algorithms MUST be ignored. The currently recognized algorithms are “sha1” and “sha256”.
k	Key type	rsa	Key type (plain-text; OPTIONAL). Unrecognized key types MUST be ignored. Currently only “rsa” is recognized.
n	Notes	(empty)	Notes that might be of interest to a human (OPTIONAL). Not interpreted in any way.
p	Public key	(none)	Public-key data (base64; REQUIRED). An empty value means that this public key has been revoked. This is the only required tag.
s	Service type	* (allow all)	Service Type (plain-text; OPTIONAL). A colon-separated list of service types to which this record applies. Unrecognized service types MUST be ignored. Currently only “email” is recognized.
t	Flags	(no flags set)	Flags (plain-text; OPTIONAL). A colon-separated list of names. Unrecognized flags MUST be ignored. The defined flags are as follows: “y” – this domain is testing DKIM (test mode) “s” – verifiers MUST check for domain alignment (strict mode)