E-Mail black list not working?

[vvenet]

Dear support team,

For one email address in my account I use the ‘black list’ feature (advanced settings). In the control panel it is clearly explained that “Emails from senders in the black list are classified as spam”.

I made two entries in the black list: one specific email address and a generic for a specific domain like *@specificdomain.cl.

I notice however that your system is neglecting my black list entries. Instead that these incoming emails are not classified as spam, therefore not put in the spam folder but remain in the inbox.

I can’t find any related topic for this on the forum. That is why I now turn to you and kindly request your assistance. 

Question: how to activate the black list feature in such a way, that blacklisted emails are classified as spam and put into the spam folder?

Thank you very much and kind regards.