Step 1:

All emails will be digitally signed and can be checked for authenticity by the recipient server. For this purpose a DKIM key will be added to our nameserver. However, the DKIM signature of an email can only make sure that the email is unalteredly delivered to a recipient and to prevent spoofing. A DKIM signature does not tell anything about whether it's spam or not spam.

This tutorial only explains how to set a DKIM record. It requires that you are using an external email server that supports DKIM.

Log in to your KAS (Technical Administration) panel and click the menu item Tools -> DNS Settings on the left.

Click the Edit icon right next to the domain and then click on Add a new DNS record.

Step 2:

In the Name field you need to enter the custom selector (key name) e.g. "mail" followed by "._domainkey". As Type please select TXT (DKIM). The Priority remains 0 and the entry that must be entered in the #Data# field should look like this:

v=DKIM1; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDBc+Pb4+we0JZlYdFun1iHle7qfEUWlMlzOrz8E2CHRQqa7GtQuyqUDWb QrjXrz2lcxmfVRTAp3WvhbTO/Rm5qqKlNuuHPoraCK3r/C/lKdZW/c3Ag292pGHdDbQvHIActYjQVIikLmGzQs8jM/Zl4nEoTZyz1gIKqx 6tLIfDHVwIDAQAB

v specifies the DKIM version. As yet there is only "DKIM1". This leading entry is optional, but is recommended by the RFC.

p specifies the public key. Parameter and value are divided by an equals sign (=) without spaces between and with a semicolon at the end.

Other optional parameters are:

k specifies the used key type. As yet there is only "rsa".

h specifies accepted/allowed hash algorithms. Without this parameter all algorithms will be accepted.

t specifies special properties, e.g. if it's only for testing purposes or if the key is also valid for subdomains.

Please note that the data field can contain up to 512 characters. This allows keys with a strength up to 2048 bits.

Step 3:

The new entry will now show up in the table.