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2.1   Requirements

SpamSieve works with macOS 10.13 and later, as well as pre-release versions of macOS. For older versions of macOS, previous versions of SpamSieve are available.

Supported Mac Mail Programs

SpamSieve is designed to work with the following e-mail programs that are currently under development:

iOS Mail and Web Mail

SpamSieve does not run on iOS, but you can use it together with your Mac to filter mail on your iPhone, iPad, or iPod touch. This is described in the iPhone Spam Filtering section.

SpamSieve works with Web mail providers via Apple Mail. Please see the Setting up Gmail, iCloud, Yahoo, AOL, or Other Web Mail section.

Supported Legacy Mac Mail Programs

SpamSieve also works with these legacy e-mail programs:

Multiple Accounts/Addresses

SpamSieve filters all of your mail accounts. There is no extra charge for additional addresses.

Multiple Mail Programs

You can freely switch between mail programs or even use multiple mail programs at once. SpamSieve will share its training data and statistics among them.

Unsupported Mac Mail Programs

SpamSieve does not have direct integration with the following mail programs. You can, however, still use them with SpamSieve as described in the Setting Up Other Mail Clients section.

Mail Program Differences

SpamSieve works roughly the same way with each mail program. This section describes features that are only available in certain mail programs.


These mail programs support automatically deleting old Spam messages: Apple Mail, Entourage, Outlook (not Outlook 365), Postbox.

Complete Message Access

These mail programs allow for more accurate filtering because they let SpamSieve access the entire raw source of each message, including the attachments: Apple Mail, Airmail, Entourage, GyazMail, MailMate, Mailsmith, Outlook.

Custom Rules

These mail programs let you control SpamSieve through a regular rule, so that you can determine how it interacts with your other rules: Apple Mail, Entourage, GyazMail, MailMate, Mailsmith, Outlook 2011, PowerMail.

Drone Support

These mail programs work with the setup described in Setting Up a Spam Filtering Drone: Apple Mail, MailMate, Outlook 2011 (not Outlook 365, 2016, or 2019).

Refiltering Messages

These mail programs let you manually re-apply SpamSieve to old messages: Apple Mail, Entourage, GyazMail, MailMate, Mailsmith, Outlook, Postbox, PowerMail.

Spam Levels

These mail programs can display spam messages in different colors or with a numeric score to indicate their level of spamminess: Apple Mail, Entourage, MailMate, Mailsmith, Outlook, PowerMail.

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