How to Set Up a DKIM Signature

Domain Keys Identified Mail (DKIM) technology is the process of authentication of a sender's domain using a generated digital signature. The method helps recipients’ servers verify that the email was actually sent from the claimed domain, which improves your email deliverability.

In this article, we'll look at how you can generate a signature for your domain to send emails from SendPulse’s servers and add it to your domain's DNS settings registrar site.

Read also: How to set up SPF record.

Generate a DKIM Key

Go to the "SMTP Settings" > "Sending Domains" tab. Click Create DKIM next to the domain you want to authenticate.

In the next window, click Generate.

Copy the value from the "Public Key Record" field.

Click Save to save the generated entry and close the window.

You will need to create a TXT record on your DNS settings provider’s site using the smtpsign._domainkey name and the following value: v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDBOj8hLCE2hCc44Y0i4DSsi8OCBe5dRtC699VpyDmtP9tV+2bJMBNJcX8uoqyGdtMjhNcTXzu4kWSgaLq8LRKwMzb8RxevZcje/3dKDzoPdNDffijRW+uiZupBiV6RvMHIy3/Xk0vEqqULXVZgL4bk7F0Ue1uwIDAQAB.

The article provides a value example. You can find your own public key value in your account.

Add an Entry to the DNS Provider Website

You can check where your domain's DNS settings are located using the MxToolbox tool. Follow the link, and enter your domain. Select "SOA Lookup" or “DNS check” from the drop-down list, and click the button.

If your registrar does not provide default DNS servers, you can activate this service separately, for example, using cPanel.

In our example, we will use cPanel to add an A record to our site's DNS registrar.

Learn more about how to set up TXT records in cPanel’s documentation.

In the domain control panel, select "Zone Editor."

Next to your domain, click Manage.

Click +Add Record.

Paste the values ​​in the corresponding fields:

In the "Name" field, paste the smtpsign._domainkey record name, and your hosting can add the domain name. For example, for cPanel, it will be smtpsign._domainkey.yourdomain.com

In the "Type" field, select the "TXT" record type.

In the "Record" field, paste the record value without quotes.

Click Save Record.

Once you add the entry, you need to wait for the activation, which may take up to 24 hours, depending on the work of the hosting.

Check the Entry Status

You can check the status of your added entry using MxToolbox or Google Admin Toolbox. Follow the link, and paste your full domain name, for example smtpsign._domainkey.yourdomain.com. For MxToolbox, select "DKIM Lookup" in the drop-down list. For Google Admin Toolbox, select the "TXT" entry.

You can also check the entry status directly in your SMTP account. Go to the "SMTP Settings" > "Sending Domains" tab. Click the arrow next to the domain you want to verify, and select “Verify DKIM.”

If you have configured everything correctly and the DNS settings have been updated, you will receive a corresponding message.

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