MailWasher Pro allows you to preview multiple accounts and all aspects of your e-mail before you download it to your computer. The program also learns what kind of e-mail you want to receive and adapts to your preferences. You can then delete spam before it gets to you and even report it to the central FirstAlert database, where it is verified to ensure that no other MailWasher Pro user gets it. Other features help identify and protect you against viruses and worms. Also included are comprehensive, customizable filters; use of public blacklists to identify spammers; and multiple accounts. MailWasher Pro is compatible with POP3, Hotmail, MSN, AOL, and IMAP.

Version 4.1 lets users set their own global "Restore from tray" hot key. Also added are changes to the Learning system that should result in a noticeable increase in effectiveness.