1. What is DKIM?
DKIM (DomainKeys Identified Mail) ensures that an email truly originates from the sender's domain (the domain name after the @ in your email address) and that it has not been altered during transit. It is a digital signature added to email headers. This signature can be verified by the recipient by comparing it to an encryption key associated with your domain name. Thus, emails are authenticated by your organization, which takes responsibility for sending the message. DKIM is a key element in the fight against fraudulent emails.
2. Why use DKIM?
Using DKIM improves your email deliverability. Indeed, more and more receiving servers used by your recipients (Gmail, Outlook, Orange, etc.) require the implementation of DKIM to fight against phishing and spam, thereby protecting recipients. Furthermore, using DKIM grants a better reputation to your emails and avoids certain alert messages displayed by email services like Gmail.
3. How to set up DKIM?
Setting up DKIM is done in a few steps:
First, contact your IT Department to verify that they authorize the addition of SPF/DKIM rules to your domain name (DNS).
You can then request the information from our support team to pass on to your IT department so they can register it on your domain name.
Once the registration is effective, contact our support again so that the signature of your emails can be activated.
4. How to verify that DKIM is correctly set up?
There are online tools that allow you to verify if DKIM records are effective on your domain name, for example: https://easydmarc.com/tools/dkim-lookup. Once email signing is activated, you can send yourself a test email. By browsing the "original message," you should find a line containing "DKIM-Signature."
5. What if I have deliverability issues despite setting up DKIM?
Implementing DKIM is an important element for improving email deliverability, but it is not the only one. Indeed, some mail servers perform more advanced checks by analyzing message content. It is also necessary to ensure that sent emails comply with best practices (personalized emails, easy unsubscription, attachment size, etc.).