DKIM Inspector

DKIM Record Checker

The DKIM selector is specified in the DKIM-Signature header and indicates where the public key portion of the DKIM keypair exists in DNS.
With the DKIM Inspector you can check if the public part of your DKIM signature—using the selector—has been implemented correctly in the DNS of your domain.

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Public key length

Notes

Warnings / Errors

Details

Tag

Name

Value

Default

None

Congratulations! Your DKIM record is valid.

There is something wrong with your DKIM record.

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Read more about DKIM Selectors here.

Legend

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. Supported values: “rsa”, “ed25519”.
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 An empty value means that this public key has been revoked.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)
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