If you want to ensure a reliable email delivery, you have to view different areas. On the one hand, you have the ability to positively influence the delivery of your newsletters on your own – especially when it comes to sending trusted emails, which should end up directly in the inbox of your recipients and not in the spam folder. On the one hand, high delivery can also be guaranteed by technical measures.

Today, we would like to take a closer look at these technical measures. We’ll show you what’s behind the abbreviations SPF, DKIM and DMARC. However, the most important thing to know: Many of the technical measures are included in the mailworx service – most of these are settings that your IT administrator can implement without much effort.


The abbreviation SPF stands for Sender Policy Framework. Behind this is a procedure intended to curb the misuse of trusted email addresses by spammers. When an email is received, it is checked whether the sending server is actually allowed to use the specified sender address. If this is not the case, the email is more likely to be classified as spam. By setting the SPF record, you can determine which servers are authorized to send emails with the (sender) domain.


Behind DKIM stands the word DomainKeys Identified Mail and another technical measure to ensure the delivery quality of your mailings. It should be prevented in particular that receivers are deceived by so-called spoofers. Spoofers are scammers who send emails, which are similar to other institutions, like a bank or large online shops. Activating DKIM marks each email with an invisible digital signature. The DomainKey is a key that is publicly available so that receiving email servers can verify this signature.


DMARC stands for Domain-based Message Authentication, Reporting and Conformance. It is a measure to identify and take precaution against spoofer. This technique builds up on SPF and DKIM. It determines how the recipient of an email should authenticate the sender. In addition, the sender can provide a recommendation on how the recipient should deal with emails that fail to check SPF and DKIM. These are either marked as spam or rejected by the recipient. You will also receive regular reports on whether the authentication of SPF, DKIN and DMARC has been successful.

However, do not worry about all these technical terms – your mailworx service crew knows best about these measures and supports you in the implementation in order to improve your email delivery. Simply get in touch with us and we will check the settings with you and your IT administrator. In addition, mailworx 9.2.5 (released on 28/3/2018) extends the pre-shipment check and shows you, if the most important technical measures have been taken.

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