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Create and use DKIM / DomainKey keys

Step 1

Creating the keys

 Two keys are required. A private key and a public key. The private key signs outgoing e-mails. 

 The public key must be published in the DNS.


First the two keys are generated with OpenSSL, for this the following commands must be used.  

Since the selector in this example is check_1, it makes sense to create the keys with the same name:


openssl genrsa -out check_1.private.key 1024

openssl rsa -in check_1.private.key -pubout -out check_1.public.key


 This creates 2 files for the private and public key.

Depending on the program with which the e-mails are signed, the files can be stored in the corresponding folder on your mail server.


Amavisd: /var/spool/amavis

dkim-proxy: /etc/dkimproxy

dkim-filter: has no configuration folder


Alternatively, the keys can be created with an online generator:

An explanation of domainkeys can be found here.

Step 2

Now the public key has to be stored in the DNS settings.

On our homepage at click on "Login" in the upper right corner, to log in to your 'customer area'.

You will reach the login form where you can enter your customer login and password. 

and then click on the "Login" button.

Step 3

You are now in your customer area. In the left navigation click on the navigation point "Domains".

Step 4

In the domain overview, select the domain for which you want to change the IP address. Click on "Configuration" for the desired domain.

Step 5

Click on the menu item "Checkdomain Nameserver" on the detail page of the desired domain.

Step 6

In the following input mask, set a TXT entry for professional settings, as shown here for the domain key with the selector check_1.

Then click on the "Save" button to confirm your entry.

Important note!

The nameservers are managed independently.

The data is stored on the name servers immediately. Until the name servers have been changed is effective, it can take about 2 - 6 hours.

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