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:

• Apple Mail from macOS 10.13 and later.
• Airmail 1.3.1 (223) and later. Versions 3.6.3 through 3.6.41 are not compatible with SpamSieve on macOS 10.14, but version 3.6.42 and later are.
• GyazMail 1.2.0 (1.5.8 or later recommended).
• MailMate 1.1.2 and later from Freron Software.
• Mailsmith 2.3.1 and later from Stickshift Software. (By applying this workaround you can use SpamSieve with Mailsmith 2.1.5.)
• Outlook from Microsoft Office 2011 (14.x) and later, including Outlook 15.x and 16.x from Office 365. Outlook needs to be running with “New Outlook” turned off, which it does not allow when running in free mode. Outlook Live and other browser-based mail are not supported, except via the Mac clients listed here.
• Postbox 2.0 through 5.x from Postbox, Inc. Postbox 6 and 7 are not currently compatible. Postbox Express and the (discontinued) Mac App Store version of Postbox are not compatible.
• PowerMail 5.0 and later (6.x recommended) from CTM Development. PowerMail only supports SpamSieve with POP accounts.

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:

• Entourage v.X (2001) and later (Entourage 2004 or 2008 recommended) from Microsoft.
• MailForge 2.0.4 and later from Macsimize Software (formerly from Infinity Data Systems).

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.

• Canary Mail is not sufficiently extensible for us to connect it with SpamSieve. We have offered to help the developers add support for SpamSieve, and they have expressed interest. Sending them feedback (click the blue-and-white icon at the bottom-right) will help them prioritize this feature.
• MailPlane is not sufficiently extensible for us to connect it with SpamSieve. Please contact the developers and tell them that you would like to use SpamSieve with it.
• Mail Pilot is not sufficiently extensible for us to connect it with SpamSieve. We have offered to help the Mail Pilot developers add support for SpamSieve, and it’s on their to-do list. Sending them feedback will help them prioritize this feature.
• Newton is not sufficiently extensible for us to connect it with SpamSieve. Please contact the developers and tell them that you would like to use SpamSieve with it.
• Spark is not sufficiently extensible for us to connect it with SpamSieve. We have offered to help the Spark developers add support for SpamSieve, and they have expressed interest. Sending them feedback will help them prioritize this feature.
• Sparrow is not sufficiently extensible for us to connect it with SpamSieve. The Sparrow developers were interested in adding support for SpamSieve, but the product has since been acquired by Google and seems to no longer be under development.
• Thunderbird. Current versions of Thunderbird have removed support for compiled plug-ins. However, SpamSieve does work with Postbox, which is an enhanced version of Thunderbird.
• Unibox is not sufficiently extensible for us to connect it with SpamSieve. We have offered to help the Unibox developers add support for SpamSieve. Sending them feedback will help them prioritize this feature.

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.

Auto-Deletion

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.