Due to the versatility of email messaging, the prevention of spam mail cannot be executed without fault in a way that would ensure 100 % prevention of spam mail without endangering the loss of wanted mail. This is what cyber criminals attempt to exploit.

The priorities of securing email messaging are:

  1. wanted mail must reach its recipient without fail
  2. unwanted traffic must be rejected

Cyber threats

The quantity and quality of cyber threats varies considerably all the time. Spammers are constantly searching for new ways to bypass and fool protection mechanisms that operate with the principle that wanted traffic must be delivered without delay.


What follows from this is that some users will always receive some of the newest forms of spam. The radical changes in cyber threats manifest as a wave effect in unwanted traffic; after a long period of no spam, there can be a large-scale burst of it, which can last for several days.


A cure cannot be made before the illness has been discovered. Every time a new version or sender emerges, our experts investigate the mail, and required adjustments are first tested in a test environment to ensure that the prevention measures will not affect the faultless delivery of wanted mail.

In other words, ensuring the faultless delivery of wanted mail is the root cause of spam mail occasionally getting through. Some of these have been marked as spam but some may not be. If you wish that your adjustments are made stricter, contact us at info (a) d-fence.eu.

Why do I get the same spam over and over again, even from myself?

The ”FROM” and ”TO” fields in email messages are text fields that spammers can add anything to. Neither of these have anything to do with the actual sending or receiving email messages.

In email prevention, the significant information is always in the mail’s header » . The actual content of the mail visible to the receiver is not significant in terms of prevention. From the perspective of prevention, changing the header information that is invisible to the user as well as adding a new, clean sender, creates a completely new email.

Cyber criminals also try to exploit the ignorance of users; many companies add their own domain in the to their “white list”. This causes spam traffic to get through more easily, as the header information can include a whitelisted domain.

Currently, one of the growing problems in Europe is “legal” email marketing. Technically it would be possible to block it, but legally it can currently only be blocked if the customer specifically requests it.

Mainsleaze spam »