Mailblocks today announced availability of its spam-free, Web-based e-mail service optimized for Mac OS X. Effective immediately, Mailblocks is available to support consumers using the Safari Web browser, Apple’s Mail and Microsoft’s Entourage X. “Mailblocks brings a new class of Web-based consumer e-mail to the Macintosh OS X platform. Incorporating its patented Challenge/Response technology, Mailblocks’ new release delivers the most effective method available for fighting spam, while making consumer email a safe harbor for online communications.” Pricing for Mailblocks’ new Mac OS X service is US$9.95 per year with 12MB of storage and an Expanded Service with 50MB of storage for $24.95. Both offer attachment allowances of 6MB.