What are some alternatives?
When comparing Mailwasher and Spam Reader, 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.
Scrollout F1 - Scrollout is a free and easy to use anti-spam email gateway designed for Linux & Windows administrators without advanced email security experience.
SpamSieve - Save time by adding powerful spam filtering to the e-mail client on your Mac.
Spamfence.net - Professional e-mail security free for private use: With Spamfence.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
POPFile - POPFile classifies email into categories you define.