SpamSieve
SpamSieve: A focused local Bayesian filter for Mac users who want detailed mail controls. Ranked #14 of 27 in Email Anti-Spam Software by our editors (7.8/10); pricing: 30-day trial; best for mac users wanting local Bayesian filtering.
At a glance
- Editor score7.8 / 10
- Pricing30-day trial
- Best forMac users wanting local Bayesian filtering
- Free planNo
- Paid from$39.99 one-time
- Facts checked22 Sep 2026
Where it wins
- Bayesian filtering improves through training from good and spam messages.
- Custom rules, scoring, logs, statistics, and attachment-name analysis.
- Supports multiple accounts across a wide range of Mac mail clients.
Where it doesn't
- Runs only on macOS and supported Mac email clients.
- New Outlook cannot be directly integrated; legacy Outlook is supported.
- Malware scanning is not included.
Our verdict on SpamSieve
SpamSieve is a macOS application for filtering unsolicited email within supported Mac email clients. It uses Bayesian analysis and training from good and spam messages to classify mail, then moves suspected spam to a separate mailbox instead of deleting it. The product is aimed at Mac users who want local filtering across multiple accounts, with more control than a basic mailbox-level spam folder provides. It is especially suited to people who want to manage allowlists, blocklists, scoring, and custom matching rules from within their desktop mail workflow.
The published plan is straightforward: SpamSieve costs $39.99 as a one-time purchase and covers one person or one computer. A 30-day free trial is available. The integration list includes Apple Mail, Airmail, GyazMail, MailMate, MailMaven, Entourage, MailForge, Mailsmith, Postbox, PowerMail, and Microsoft Outlook in legacy mode. AppleScript is also supported. This breadth makes the application useful for Mac environments built around established desktop clients, while its mailbox-app deployment keeps filtering close to the user's mail workflow rather than placing it at the server gateway.
Its main strength is control over classification: users can train the filter, define header or body-text rules, apply attachment-name rules, review spam scores and color indicators, inspect statistics and logs, and use special mailboxes for remote training. The trade-off is a narrow platform and client scope. SpamSieve is not a server-side gateway, supports macOS rather than other platforms, and cannot directly integrate with New Outlook. Malware scanning is also explicitly false, so organizations seeking centralized filtering, broader platform coverage, or malware protection should choose a different category of product. Mac users who want local Bayesian filtering and detailed rules are the clearest fit.
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SpamSieve pricing
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SpamSieve fact sheet
| Free plan | No |
|---|---|
| Paid from | $39.99 one-time |
| Phishing detection | Not verified |
| Malware scanning | No |
| Attachment scanning | Yes |
| Quarantine access | Not verified |
| Supported mail platforms | Apple Mail, Airmail, GyazMail, MailMate, MailMaven, legacy Outlook, Entourage, MailForge, Mailsmith, Postbox, and PowerMail |
| Quarantine retention | Not verified |
| Deployment type | Mailbox_app |
| Free trial | 30 days |
| Deployment | Desktop |
| Platforms | macOS |
| Support | Email, Community, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 12 integrations: Apple Mail, Airmail, GyazMail, MailMate, MailMaven, Microsoft Outlook (legacy mode) … |
| Pricing | 30-day trial (source) |
| Website | c-command.com |
| Facts checked | 22 Sep 2026 |
SpamSieve integrations
SpamSieve lists 12 integrations on its own site.
- Apple Mail
- Airmail
- GyazMail
- MailMate
- MailMaven
- Microsoft Outlook (legacy mode)
- Entourage
- MailForge
- Mailsmith
- Postbox
- PowerMail
- AppleScript
Alternatives to SpamSieve
- Barracuda Message ArchiverA strong email archive for compliance workflows, but not a primary anti-spam filter.9.4
- Symantec IT Management SuiteA broad endpoint management suite, but not a focused email anti-spam product.9.3
- MX GuarddogA low-cost cloud gateway for domain owners who run their own email servers.8.7
See all SpamSieve alternatives →
Also Ranked In
SpamSieve is ranked in 2 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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