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SpamSieve

Free trial Mac

Visit SpamSieve Alternatives Pricing

SpamSieve's own site

What SpamSieve is

SpamSieve is a macOS app that adds spam filtering to compatible Mac mail programs. Its Bayesian filter adapts to incoming mail and works across mail accounts from any provider or host, without an extra fee for additional addresses or devices. You can create allowlist and blocklist rules based on headers or message text, including regular expressions. The app decodes encoded messages and checks attachments for spam content, and macOS Contacts integration helps keep messages from contacts out of spam. Mail data remains on the Mac; SpamSieve does not need account login access or transmit mail data elsewhere. Supported programs include Apple Mail, Airmail, GyazMail, MailMate, MailMaven, Outlook, and other listed clients. It requires macOS 10.13 or later and a compatible mail program. The one-time purchase starts at $39.99, with a 30-day trial. Browser-based mail and iOS are not directly supported.

Who it suits

SpamSieve suits Mac users running a compatible desktop mail client who want adaptive filtering and attachment inspection. It can also filter mail synchronized to iPhone or iPad through IMAP or Exchange.

What it does well

  • Adaptive Bayesian filtering
  • Rules support headers, body text, and regex
  • Checks attachments for spam content
  • Mail data stays on the Mac
  • 30-day trial available

What to know first

  • No free plan
  • Requires macOS 10.13 or later
  • Browser-based mail is unsupported
  • Does not run on iOS

Limits

The $39.99 purchase covers one person or one computer. SpamSieve requires a compatible Mac mail client and does not support browser-based mail directly or iOS.

Plans

PlanBilled and limitsPrice
SpamSieveOne-time purchase · One person or one computer; family or 2 users: $63.98; volume discounts available$39.99, paid once

As c-command.com lists them, read 8 Oct 2026. The maker's own page has the final word.

Getting started

  1. Open the SpamSieve website
  2. Start the 30-day trial or choose the one-time purchase
  3. Install it on a Mac running macOS 10.13 or later
  4. Use it with a compatible supported Mac mail program
  5. Configure allowlist or blocklist rules if needed

Verdict

SpamSieve is focused on filtering mail inside supported Mac applications, with local processing and customizable rules. Confirm your mail client is supported and note that malware scanning is not included.

Questions

How much does SpamSieve cost?

The SpamSieve plan costs $39.99 USD as a one-time purchase for one person or one computer. Family or two-user purchase costs $63.98.

Is there a trial?

Yes. A 30-day trial is available.

Which mail programs work with it?

Supported programs include Apple Mail, Airmail, GyazMail, MailMate, MailMaven, Outlook, Entourage, MailForge, Mailsmith, Postbox and PowerMail.

Does SpamSieve run on iOS?

No. A Mac running SpamSieve can filter mail synchronized to iPhone or iPad through IMAP or Exchange.

Does it scan attachments for malware?

It can inspect attachments for spam content, but malware scanning is not included.

Facts from SpamSieve's own pages

Contacts
It integrates with the macOS Contacts app so messages from contacts are not marked as spam. · c-command.com, 8 Oct 2026
Custom rules
Users can create allowlist and blocklist rules matching message headers or body text, including with regular expressions. · c-command.com, 8 Oct 2026
Email accounts
It works with any mail provider or host, filters all mail accounts, and charges no extra fee for additional addresses or devices. · c-command.com, 8 Oct 2026
Filtering
It uses Bayesian spam filtering that adapts to the mail you receive. · c-command.com, 8 Oct 2026
iPhone and iPad
SpamSieve does not run on iOS, but a Mac running SpamSieve can filter mail that synchronizes to an iPhone or iPad using IMAP or Exchange. · c-command.com, 8 Oct 2026
Mail integrations
Supported current Mac mail programs include Apple Mail, Airmail, GyazMail, MailMate, MailMaven, and Outlook. · c-command.com, 8 Oct 2026
Maker
C-Command Software was founded in January 2002 by Michael Tsai to develop Mac utilities and productivity applications. · c-command.com, 8 Oct 2026
Message inspection
SpamSieve can decode encoded messages and inspect attachments for spam content. · c-command.com, 8 Oct 2026
Privacy
Mail data stays on the Mac; SpamSieve does not need mail account login access and does not transmit mail data elsewhere. · c-command.com, 8 Oct 2026
Purchase and upgrades
The app is sold as a one-time purchase; maintenance releases and minor feature updates are free, while major upgrades may be discounted depending on purchase date. · c-command.com, 8 Oct 2026
Purpose
SpamSieve adds spam filtering to an e-mail client on a Mac. · c-command.com, 8 Oct 2026
Requirements
SpamSieve works with macOS 10.13 and later and requires a compatible Mac mail program. · c-command.com, 8 Oct 2026
Support
The maker offers individualized support by email and provides a user forum, manual, and mailing list. · c-command.com, 8 Oct 2026
Unsupported clients
Outlook Live and other browser-based mail are unsupported except through the listed Mac clients. · c-command.com, 8 Oct 2026

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