SpamSieve for Mac

Name: SpamSieve
Rating: 4.5 (148 reviews)
Author: C-Command Software

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Key Details of SpamSieve

Bayesian spam filter for most email clients.
Last updated on April 4, 2025
There have been 4 updates
Virus scan status:
Clean (it’s extremely likely that this software program is clean)

Editors’ Review

Download.com staffApril 4, 2025

SpamSieve integrates with many different mail programs to provide a more complete service to keep spam messages out of your Inbox. The more you use this program, the more effective it will be for you and the less likely you are to see unwanted messages or to miss those you do want.

Pros

Integration options: This app can integrate with all kinds of mail programs, including Apple Mail, Airmail, Mailsmith, Outlook, and more. You can also use it with Web-based mail services like Gmail, Yahoo, and AOL, and it's compatible with iCloud as well.

Increasing accuracy: Once you have this app installed, it will immediately begin to filter your messages. But if you just sit back and expect it to do its job, you probably won't be too impressed. It works fine without input, but the more feedback you give it, by marking junk messages that wind up in your Inbox as spam and important messages that wind up in your Spam box as reputable, the more you'll get out of the program. Through this feedback, it will become better and better at identifying and sorting your incoming emails until you won't have to worry about losing reputable mail to your Spam box again.

Cons

Complicated setup: Teaching the app what messages you want in your Inbox and which you don't does take some time and effort. And that's not the only investment of time you'll have to make in this program. Just setting the app up is somewhat of a complicated process, even with the detailed instructions.

Bottom Line

SpamSieve works well, and it's a good option to consider, especially if you find a lot of spam messages sneaking into your Inbox. It integrates with so many mail programs, and it does a good job of learning and adapting to your needs. You can try it for free for 30 days with all features active. To continue using it beyond the trial period, you'll have to pay $30 for a full license.

Editors' note: This is a review of the trial version of SpamSieve for Mac 2.9.16.

What’s new in version 3.1.2

Made various changes to improve SpamSieve's filtering accuracy.
When you select spam messages in Apple Mail, the message list text is more readable through a variety of highlight colors.
Added the Processing Messages Before SpamSieve and Setting Up Airmail 1-3 sections of the manual.
Worked around a change in the forthcoming macOS 10.15.4 that could prevent Mail from loading SpamSieve's plug-in if you had relocated your home folder to another volume.

SpamSieve for Mac

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Full Specifications

GENERAL

Release: March 6, 2020

Latest update: April 4, 2025

Version: 3.1.2

OPERATING SYSTEMS

Platform: Mac

Operating System: Mac OS X

POPULARITY

Total Downloads: 11,728

Downloads Last Week: 3

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Last Updated

User Reviews

4.5/5

148 User Votes

SpamSieve won't get a 4.5 star rating from this user.
JimInSanDiegoJuly 24, 2017
Pros
I can't think anything as a pro.
Cons
It is difficult to install. It is more difficult to configure. And worse yet impossible to debug. It needs constant, repetitive user actions then still fails to stop spam. It actually has put email from a personal contact into the spam. It is uninstallable unless you know how to manually delete its crap in the Library folders.
Summary
I honestly do not understand why SpamSieve gets such high ratings when it keeps failing over and over and over to catch spam I receive that I know I have previously trained as spam at least a dozen times before. I kept track today and fully 28 spam messages got through SpamSieve and into my inbox and I had marked each one them as spam before. I can check the blacklist and see my spams listed but they just keep coming through anyway. I have added people to my Contacts yet they get thrown onto the spam folder. I am no neophyte to the Mac having used them since the 80s and having been an IT Director for a high school for 10 years. I have read and followed the directions carefully many, many times. I have deleted SpamSieve then started over from scratch at least 8 - 10 times where I blow away anything and everything SpamSieve. And I know enough to dig into the Library Folders (Mine and the System's) to find all supporting folders/files and .pref files and deleted everything before reinstalling. I reinstall, begin to train the good and the spam and within a day or two the messages I had marked as spam get right through the SpamSieve filter. I have communicated with Michael Tsai, (I do have to give credit to Mr Tsai because he has been diligent about supporting his program.) then followed his recommendations yet spam gets through. I might as well just remove SpamSieve permanently because the Spam filter in Apple Mail actually catches as much of not more than SpamSieve h
This spam filter really works
kdantiSeptember 21, 2013
Pros
Once trained spam email that makes to my inbox is very infrequent. Much better than all other spam filters I use. This included spam assassin and apple mail spam filter. It's really nice to have a spam free inbox. Something I haven't had since the invention of spam.
Cons
The $30 cost for a spam filter seems high. If this was a lifetime subscription it might be more acceptable. This cost may make me live with the poorer filters that cost me nothing.
Summary
Best Spam Filtering Program for the Mac
dudemanlaSeptember 6, 2012
Pros
I have been using SpamSieve (spam filtering) for several months now after Intego's Anti-Spam stopped being updated for 10.8. I am very happy with this program and works with Mac Mail. The maker of this app is very helpful and responds quickly to questions. Five out of Five mice rating :) I actually enjoy training the messages and watching them disappear. I am a Mac tech here in Los Angeles and without hesitation recommend this to my clients when they tell me they have a spam problem on their Mac.
Cons
None that I found.
Summary
Still testing...
ASONGBIRDMay 29, 2012
Pros
Seems to make quick adjustments for accuracy and it seems to work well shunting the junk to the proper folder. Easy to set up with Mac Mail program.
Cons
Hung up this morning, necessitating reboot of computer to solve.
Summary
Still testing; seems to do good sorting job; waiting til test time runs its course to finalize opinion.
This is an excellent product.
DaffieMay 15, 2012
Pros
SpamSieve was very easy to install, and from the very start caught all but a few spam messages. If a spam message goes into the "good" mail or vice versa it's very simple to train it to go to the correct place. So far SpamSieve has a 99% correct rate! I'm very very pleased!
Cons
None so far.
Summary
Not worth the effort and painful to uninstall
noirmoutonJanuary 11, 2012
Pros
There are none.
Cons
No gain over Apple's standard junk mail feature and extremely difficult to uninstall.
Summary
Apples junk mail filter is just as good, there's nothing to gain from using Spamsieve. Much worse it's very difficult to delete this program after you've installed it. Right now after deleting everything as suggested by Spamsieve I've got a Spam folder that keeps coming back on Apple's mail client and every single email is going there. I'm going to waste hours of my time trying to fix this piece of junk's installation. Don't buy but even more importantly don't even try.
Eliminates spam, better than Mail's junk filter
RustyIronAugust 17, 2011
Pros
Very accurate
Cons
Takes a couple minutes to set up, and you have to read the directions.
Summary
I've been using Spamsieve for years. When upgrading to Lion, I decided to get rid of all superfluous software, which resulted in my deleting Spamsieve and enabling Mail's junk filter. After a couple weeks, I grew tired of all the errors of the built in junk filter, so I reinstalled Spamsieve. I'm looking forward to once again enjoying my email experience without the frustration of dealing with spam.
I've counted on SpamSieve for years
wmoyesJuly 15, 2011
Pros
Once you train SpamSieve to recognize what you consider spam, it works seamlessly behind the scenes to keep junk out of your Inbox. Tech support is great if you have questions.
Cons
none......
Summary
I've been using SpamSieve for nearly 10 years. I think it's the best spam filter I've ever used.
Without a doubt the best spam filter for Mac!
RAKlineMarch 2, 2011
Pros
Continually updated - extremely few false positives and false negatives.
Cons
None I'm aware of.
Summary
Try it and see what you think.
No difference between my Apple junk mail filter and SS
DarlieBEMarch 1, 2011
Pros
2.8.3 locked up Apple Mail
Cons
Way too expensive.
Summary
Too complex.

Developer’s Description

By C-Command Software

Bayesian spam filter for most email clients.

SpamSieve gives you back your inbox by bringing powerful Bayesian spam filtering to popular e-mail clients. It learns what your spam looks like, so it can block nearly all of it. It looks at your address book and learns what your good messages look like, so it won't confuse them with spam. Other spam filters get worse over time as spammers adapt to their rules; SpamSieve actually gets better over time as you train it with more messages. SpamSieve doesn't delete any messages--it only marks them in your e-mail client--so you'll never lose any mail. SpamSieve works with any number of mail accounts, of whatever types are supported by your e-mail software (e.g. POP, IMAP, Hotmail, AOL). Powerful Bayesian spam filtering results in high accuracy and almost no false positives. It adapts to the mail that you receive to get even better with time. Some other e-mail clients include Bayesian filters, but SpamSieve is more accurate.

SpamSieve for Mac

Key Details of SpamSieve

Editors’ Review

Pros

Cons

Bottom Line

What’s new in version 3.1.2

SpamSieve for Mac

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User Reviews

SpamSieve won't get a 4.5 star rating from this user.

This spam filter really works

Best Spam Filtering Program for the Mac

Still testing...

This is an excellent product.

Not worth the effort and painful to uninstall

Eliminates spam, better than Mail's junk filter

I've counted on SpamSieve for years

Without a doubt the best spam filter for Mac!

No difference between my Apple junk mail filter and SS

Developer’s Description