Why did this happen? There are many potential reasons for poor deliverability, but, as it turned out, Mark forgot to set up DKIM authentication for his email account. The main purpose of DKIM is to prevent spoofing. Email spoofing is changing the content of the original message and sending it from an alternative sender that looks like a trusted source.
This is a type of cyber attack and is widely used for fraud — for example, someone sending payment request messages from an email address that looks like yours mark whatevercompany. After all, DKIM is an industry-standard for authentication. DKIM would allow Mark to take responsibility for an email message that he was about to send to Yvonne.
It happens automatically every single time once DKIM is configured for his domain. DKIM is made up of different elements, described with various tags and values corresponding to each.
As you can see, the actual signature is only a small part of DKIM. There are several other optional tags that you can use:. You can also choose to add some or all of the optional fields that we mentioned above.
Technically, the more specific details are included, the more reliable authentication will be. But you need to be careful with this too as even the tiniest details changed by your email server will lead to a failed DKIM authentication on the receiving side. If you included your entire body in DKIM, it will now inevitably fail as the body was just modified. Once the signature is verified with the public key by the recipient server, the message passes DKIM and is considered authentic.
Spoofing email from trusted domains is a popular technique for malicious spam and phishing campaigns, and DKIM makes it harder to spoof email from domains that use it. As you send email and improve your delivery practices low spam and bounces, high engagement , you help your domain build a good sending reputation with ISPs, which improves deliverability. DKIM uses two actions to verify your messages. The first action takes place on a server sending DKIM signed emails, while the second happens on a recipient server checking DKIM signatures on incoming messages.
Your private key is kept secret and safe, either on your own server or with your ESP, and the public key is added to the DNS records for your domain to broadcast it to the world to help verify your messages. If you run your own mail server, you can generate this pair on your own. We keep your private key securely stored on our servers and sign each message as it is sent. When a message is sent we create a hash from the content of the message headers and then use your private key to sign the hash.
This signature carries everything a recipient server needs to validate the message and looks like this:. Alternatively, hover over the domains tab at the top of the Account Center and click on Show All. Select the relevant domain from the list. This record will tell the mail server that all email messages associated with this domain use DKIM.
This is the public key that will be used to decode the email's associated digital signature. Once you've added both records, click on Save Changes. Allow up to 24 hours for propagation, after which time DKIM should be enabled for the domain. If your DKIM key in the Data field exceeds characters and you do not break it up with quotes, you will receive the following error:. In order to add a record that exceeds characters, you must break the record up with quotes " and add both strings to the TXT field.
In order to enter the above key into the TXT field, divide it into multiple strings using quotation marks:. Now add both strings to the same data field for the TXT record.
It works by adding a digital signature to the headers of an email message. In general terms, the process works like this:. When a mail message is sent by an outbound mail server, the server generates and attaches a unique DKIM signature header to the message.
This header includes two cryptographic hashes, one of specified headers, and one of the message body or part of it. The header contains information about how the signature was generated.
The inbound server uses this key to decrypt the signature and compare it against a freshly computed version. If the two values match, the message can be proved to authentic and unaltered in transit. A DKIM signature is a header added to email messages. It looks something like this:.
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