General: How our mailfilter works Print

(This information does not apply if the additional service SpamExperts is active for your domain.)

NOTE: Information in this article is currently only valid for a test system.

All e-mail delievered to us pass through a filter. If we find a virus in the e-mail, or it contains an illegal attachment, the e-mail is blocked.

The e-mails that are delievered to you as a recipient, will have received a score which determines if we think it's spam or not. Regardless of our classification, certain headers are added to the e-mail with information from the filter.

For an e-mail classified as not spam (total score below 5), the headers might look like this:

X-Spam-Flag: NO
X-Spam-Score: 0.3
X-Spam-Level:
X-Spam-Status: No, score=0.3 tagged_above=-999 required=5
        tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1,
        DKIM_VALID_EF=-0.1, KAM_NUMSUBJECT=0.5, SPF_HELO_NONE=0.001,
        SPF_PASS=-0.001] autolearn=no autolearn_force=no

For an e-mail classified as spam (total score 5 or higher), the headers might look like this:

X-Spam-Flag: YES
X-Spam-Score: 5.3
X-Spam-Level: *****
X-Spam-Status: Yes, score=5.3 tagged_above=-999 required=5
        tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1,
        DKIM_VALID_EF=-0.1, KAM_NUMSUBJECT=0.5, NKN_SCORE_5=5,
        SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=no autolearn_force=no

In addition, the text [SPAM] will be prepended to the subject field. This makes it easy to see if an e-mail in your inbox is classified as spam, even when you don't have any automatic filtering on the headers mentioned above.

Subject: [SPAM] This is a spammy test-mail

If you want to automatically filter e-mail we classify as spam to a spam folder, you can create a filter for this on our webmail. Se this article for more information: Webmail: Create filters for incoming mail