Meganet Webmail offers robust controls for managing spam. To access spam settings, click the "spam control" button on the lower portion of the folder pane when logged in:

On this page, you will have a number of options related to spam handling, including whitelisting and blocking addresses, viewing your quarantine, and so on. On the Simple tab, you can control how aggressive your spam filter is.

Recommended settings:

Use these settings in the Simple tab for the best control over spam.

Be sure to choose "Place spam in the Spam folder" in the Action section so that these messages are automatically sorted into the Spam folder when suspected as spam.