Otherwise you’ll encounter access denied errors: "Couldn't load private key for domain : Access to the path 'C:\Program Files\Exchange DkimSigner\keys\' is denied.". IMPORTANT: Make sure the user you’re signed into your exchange server as has permission to access whichever path you choose to store your keys. However DKIM Signer recommends storing them in the default location. You can save the generated keys to an alternative location if you wish.
DKIM Signer will then generate new public and private DKIM signing keys based on your chosen domain and selector.Ī save window will open prompting you to save the newly generated key in "C:\Program Files\Exchange DkimSigner\keys". Fill in your Domain name and Selector and click Generate new key. See DKIM Canonicalization – or – why Microsoft breaks your mail for reasons why choosing Relaxed over Simple may be the better option.Ĥ. Click Save configuration to save your changes. Navigate to the DKIM Settings tab and change the Header & Body Canonicalization options to Relaxed. Click Configure and move the priority of the DkimSigner Agent up to at least 3, if not 1 (This is to prevent other agents from potentially interfering with the headers), and then click Closeģ. Navigate to and launch the configuration executable (located under "C:\Program Files\Exchange DkimSigner\".Ģ. Now configure the DKIM Signer with the installed GUI. Once the installer has completed, click Close Configurationġ. Extract it somewhere on your Server (e.g. It includes support for Exchange Server 2007 through to 2019.
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Installing Exchange DKIM SignerĮxchange DKIM Signer is an open source, easy to install DKIM Signing Agent for Microsoft Exchange Server. If you want to know more about how DKIM works, Postmark provides a pretty detailed explanation. Once the hash made with the private key is verified with the public key by the recipient server, the message passes DKIM and is considered authentic. Recipient servers can then use a public key published to a domain’s DNS to verify the source of the message, and that the body of the message hasn’t changed during transit. It uses public-key cryptography to sign email with a private key as it leaves a sending server. What is DKIM?ĭKIM (DomainKeys Identified Mail) is an email security standard designed to make sure messages weren’t altered in transit between the sending and recipient servers. So for now the best way to implement DKIM signing is via a third party plugin. And it doesn’t look like Microsoft has any intention of adding this feature any time soon. Out of the box Exchange Server does not support DKIM signing.
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