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Check a DKIM Core Key
- What is DKIM Core?
DKIM Core is a way to attach a token (or tokens) to an email that tells the recipient who is responsible for the email (typically the token would represent the author of the email, the operator of the email service, or the owner of a mailing list, but it might also represent others, such as email reputation or certification services).

- Who is it for?
It is for anyone who sends email and owns their own domain name.
It is likely to be most useful for senders of bulk email (whether they send the mail themselves or have the mail sent on their behalf by a third party email service provider), but is also useful for enterprises, consumer ISPs and anyone else who sends email.

DKIM Core is not intended for use by those who receive email. Receivers wishing to support DKIM Core on inbound email should implement DKIM (, as described in RFC 6376 (

- What is it useful for?
It allows an email sender to keep using the same token even if they change their “From” address, the IP address of their mailserver or the email service provider they use to send their email. That way anyone receiving the email can tell that the email is coming from the same organization as previous emails they've received.

Spam filters can then use that token to recognize that a piece of email is not spam, and should be delivered to the recipients inbox. That may be done automatically, based on email with that token having a history of being wanted by recipients. Or it may be done manually, via a whitelist agreement between the sender and the recipients ISP - in which case it may also provide other benefits, such as displaying images in email automatically.

It can also be used as a basis for feedback loops where a consumer ISP sends information about a recipients response to emails to the sender, allowing the sender to stop sending email to recipients who no longer want to receive it.

Taken together, this will allow email senders to take action to maintain good delivery rates, and provide a better experience for recipients.
mailserver  spam  dkim 
march 2018 by dusko
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