Mailwasher - Over 8 million people use MailWasher as their spam filter
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
SPAMfighter - SPAMfighter and Microsoft have built the strongest and most effective anti spam filter for Outlook, Windows Live Mail, Outlook Express & Thunderbird
Aqua Mail - Android Mail Client.
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
FairEmail - Open source, privacy friendly email app