![dkim-signature body hash not verified office 365 dkim-signature body hash not verified office 365](https://media.kasperskycontenthub.com/wp-content/uploads/sites/43/2015/02/08064547/dkim_2-scaled.jpg)
I think the easier way to get this value is to click Enable in the DKIM task pane. In our example, these will look like the following. MX preference = 0, mail exchanger = .com The value we need is the portion of the MX record before (highlighted in yellow). The domain guid is the same domain guid you see from your MX record. The is the onmicrosoft domain you received when you first signed up. The CNAME records will be in the form of: selector1-._domainkey. We will try to cover that in a future article. For these scenarios, you would need to maintain a separate key pair and set of DNS records. Nor can you import a key pair you may already be using elsewhere. Tip: The drawback with Microsoft maintaining this key pair is that you can not export your DKIM key for use in other applications. This makes configuring DKIM incredibly easy. All you need to do is to create a CNAME record to forward DKIM requests from your DNS to Microsoft. This is similar to how they handle certificates for your client access services. Instead, they take care of it for you on the back end. Traditionally a TXT record would contain your public encryption key. This may appear to contradict the TXT record described in the diagram at the beginning of the article. DNS records needed for Office 365 DKIMīefore we enable DKIM signing we need to create two CNAME records in our external DNS zone. The initial service domain,, is also designated as the default signing domain for all email domains. As mentioned earlier is implicitly signing outbound email for all our domains. This will launch the Exchange Admin Center in a new tab.įrom the Exchange Admin Center select the Protection tab and DKIM sub-tab.įrom the task view, you will notice the initial service domain, in our case, is already enabled for DKIM signing. Let’s verify how everything is currently configured in our tenant.
#Dkim signature body hash not verified office 365 how to
The remainder of this article describes how to accomplish that goal by enabling explicit DKIM signing. I prefer the domain field in my DKIM header to match my from address. If you are like me, you may want to tidy things up a bit. For more information on Microsoft’s workaround with implicit signing, I recommend this article by Terry Zink at Microsoft. With DMARC they tell recipients to accept a sender address of with a DKIM domain of. This is where they provision DKIM DNS records. Microsoft uses this method because they have no ability to edit your DNS zone file. H=From:To:Message-ID:Subject:MIME-Version:Content-Type From: Gareth SuperTekBoy ĭKIM-Signature: v=1 a=rsa-sha256 q=dns/txt c=relaxed/relaxed For example, if your service domain is and your provisioned domain is then your message headers will be signed as follows. It does this through implicit DKIM signing. Microsoft is already signing your messagesĪs of December 2015, Microsoft started rolling out DKIM signing to Office 365 domains.
![dkim-signature body hash not verified office 365 dkim-signature body hash not verified office 365](https://www.appmaildev.com/img/dkim_gmail.png)
But to an untrained eye, and might be considered the same entity. DKIM will pass because the messages are coming from. For example, I could register and configure DKIM signing. One of the drawbacks of DKIM is that it doesn’t prevent close misspellings of a domain. A DKIM=Pass is attached to the message header which increases the confidence level of the message. Successful decryption validates the sender. The recipient can then use this public key to decrypt the header (and any parts of the body). The name servers for the sender respond with a TXT record containing the public key. The _domainkey portion of the query is a fixed part of the protocol. Using our diagram above the domain field is marked as and the selector field is marked as selector1. Using these values the recipient forms the following DNS query. The recipient combines the selector and domain values to form a DNS query. The “s” value identifies a unique selector defined by the sender. In the DKIM header, the “d” value identifies the sender domain. Portions or all of the message body may also be hashed. In our example, we are encrypting the From, To, and Subject fields to name a few. The sender encrypts selected parts of the message header with its private key. This is defined by the “h” field in the diagram above. DKIM utilizes a cryptographic key pair and DNS records to provide sender validation and message integrity. It does this in the following way. What exactly is DKIM?ĭomainKeys Identified Mail (DKIM) is an email authentication mechanism designed to prevent email spoofing. In this article, we will take a look at how to enable explicit DKIM signing in Office 365.