The SpamFilter allows to separate/filter non-spam from spam e-mails prior to downloading them.

With the weak filter all e-mails coming from addresses on the "Black list" go to the spam box.

With the strong filter all e-mails coming from addresses not on the "Safe list" go to the spam box.

The advanced filter is useful when spamers manipulate e-mail's headers, use fake e-mail addresses, "undisclosed" recipients, and similar tricks to avoid spam filtration.

Users can preview e-mails, move messages to/from the spam box, add e-mail addresses or domains to "Safe list"/"Black list", and delete messages directly from the server without downloading them.