All of the anti-spam measures are by default always activated for Mailfence accounts. However, in case you want to blacklist a specific sender address (or domain), then you can create a dedicated filter rule for incoming messages with an action of your choice (e.g., Delete).
Please note that Filters option is not available in Free subscription.
1. Go to account Settings
![blacklist a specific sender address: step 1](https://kb.mailfence.com/wp-content/uploads/2019/12/setting-12.png)
2. Go to Messages -> Filters
![blacklist a specific sender address: step 2](https://kb.mailfence.com/wp-content/uploads/2019/12/filter.png)
3. Click on New
![blacklist-a-specific-sender-address](https://kb.mailfence.com/wp-content/uploads/2019/07/blacklist-a-specific-sender-address.jpg)
4. Enter Description, set Condition(s) and Action(s). For example:
![blacklist-a-specific-sender-address](https://kb.mailfence.com/wp-content/uploads/2019/07/blacklist-a-specific-sender-address-1.jpg)
5. Click on Save. Make sure that the filter is turned on.
![blacklist-a-specific-sender-address](https://kb.mailfence.com/wp-content/uploads/2019/07/blacklist-a-specific-sender-address-2.jpg)