What are some alternatives?
When comparing POPFile and Altospam, you can also consider the following products
Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
Mailwasher - Over 8 million people use MailWasher as their spam filter
RansomFree - Protect your PC from ransomware with multiple detection methods.
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
Malwarebytes Anti-Ransomware - It keeps track of all activity and, once it has enough evidence to determine a certain process or...
Spamfence.net - Professional e-mail security free for private use: With Spamfence.