Clyton is an email client with advanced security and spam filtering capabilities. Although priced for the general public, Clyton possesses the reliability and security required by large businesses.

• Built-in address book supports custom fields and import/export.
• Send personalised mass mail to a filtered set of address book contacts.
• Supports text search in a single folder or globally.
• Whitelisting prevents false positives by the spam engine. Whitelisted senders and address book contacts are never treated as spam.
• Supports message templates with merged fields.
• Message drag & drop supported.
• Attachment viewer supports a wide variety of image formats, HTML, and MIME. Images can be zoomed in and out.
• Multithreaded design keeps the user interface responsive. Receiving, sending, and spam checking are performed in the background by worker threads.
• Compose email formatted in HTML with a powerful editor. Includes spell-checking.
• Supports both POP3 and IMAP4 mail server protocols.

Free trial, some features are disabled. Windows 98, NT4, 2000, ME, XP, 2003, and Vista.