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Verify an authorized mail server using ISPconfig DKIM

by | Feb 6, 2021

Are you frustrated with spam emails? With ISPConfig DKIM – Verify an authorized mail server.

Enabling DKIM in the ISPConfig control panel is a simple method and it prevents the emails from unauthorized email senders.

As part of our Server Management Services, we assist our customers with several DKIM queries.

Today, we’ll see how our Support Engineers enable DKIM in ISPConfig and fix related errors.


What is DKIM?

DKIM uses “public-key cryptography” to verify that an email message was sent from an authorized mail server. It detects forgery and stops harmful email distribution such as spam.

In addition, DKIM is a form of email authentication. It verifies that an email message was sent from an authorized mail server, and detect harmful emails like spam.

The main advantages of DKIM include:

  • Bypass spam filters
  • Avoid phishing
  • Improve reputability


Verify an authorized mail server using ISPconfig DKIM

It works by adding a digital signature to the headers of an email message. That signature validates against a public cryptographic key in the organization’s Domain Name System (DNS) records.

DKIM is an authentication standard for a domain name that sends an email, to use against spam and phishing.

The server generates and attaches a unique DKIM signature header to the message when a mail message is sent by an outbound mail server.

This header contains two cryptographic hashes, one of the headers listed and one of the bodies of the text. The header also contains information about the origin of the signature.

When an incoming email opens an inbound mail server, it looks up the public DKIM key in DNS for the sender.

The inbound server uses this key to decrypt the signature and compare it to a newly calculated version. The message can prove to be authentic in transit if the two values match.


How we enable DKIM in the ISPConfig control panel?

Recently one of our customers contacted us regarding other servers rejecting his emails. So we recommended enabling the DKIM for his email account.

To enable the DKIM in ISPConfig we follow the below steps:

  1. Initially, we log in to the ISPCONFIG control panel.
  2. Then we go to the “E-mails” section and click >> domain on which want to perform this operation.
    Verify an authorized mail server using ISPconfig DKIM
  3. To start the generation of this key, click the button >> DomainKeys Identified Mail (DKIM).
  4. In addition, we check the ” enable DKIM ” then click Generate DKIM Private-Key ” to generate it.ISPConfig DKIM 
  5. Then, clicking on the “Generate DKIM Private-key” button automatically fills in the fields ” DKIM-Private Key ” and ” DNS Records “.
  6. Finally, click on the Save button.

Now, DKIM records added to the DNS records.

[Need assistance to enable ISPConfig DKIM? We’ll help you]



In short, DKIM is an authentication standard for a domain name that sends an email, for use against spam and phishing. Today, we saw details about the DKIM and how our Support Engineers enabled it for our customers.


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