Be the first to 
- PowerMail offers powerful and flexible filters and integrates with SpamSieve
- High-speed message indexing and search makes accessing mail a snap in PowerMail
- PowerMail has strong international language support
- PowerMail lacks support for secure S/MIME email
- Many, sometimes esoteric, options and commands can overwhelm the casual user
- PowerMail's message editor could be more powerful
- PowerMail lets you access multiple POP and IMAP accounts.
- Almost complete international language support through Unicode, uses the OS X spell checker.
- PowerMail offers powerful and flexible filter criteria and actions.
- New messages can be accessed quickly in PowerMail's "recent messages" window, and you can view emails in threads.
- PowerMail can manage mail directly at the POP server without downloading individual messages first.
- Integrates with PGP for public-key message encryption and offers SSL security for message transfer.
- PowerMail offers highly flexible and speedy indexed search, even for IMAP accounts (when cached).
- While reading mail with HTML formatting, PowerMail protects your privacy. Built-in Quick Look lets you view attachments.
- The PowerMail address book synchronizes with the system address book, and you can import and export mail safely.
- PowerMail supports Mac OS X 10.3+.
Convenient and seamless integration with SpamSieve, which uses Bayesian statistics to detect spam precisely, cleans your inbox of spam effortlessly. Yet another powerful aspect are PowerMail's speedy and flexible search options.
You can quickly search a mailbox from the toolbar, for example, and the main search engine is impressively fast and versatile, either running on its own or plugging into Spotlight. Virtual folders that collect relevant messages automatically could be a useful next evolutionary step. PowerMail already finds other messages in a thread, and has Mac OS X's Quick Look built in for attachments.
Unfortunately, PowerMail's message editor is not as powerful as the search features. It can't properly reflow text; rich-text editing is limited and a bit clumsy (fonts are selected from a menu without preview, for example). PowerMail offers nice text clippings that can be used flexibly for frequent messages, though, and the support for HTML in incoming emails works well while protecting your privacy (PowerMail does not fetch remote images automatically).
