I would like to make the following suggestions for Power Mail:

Add a feature suggestion option to your website.

Respond to customer emails.

V6 seems to have issues with some HTML links to webpages that makes me open the message in safari in order to click the link.

Create a new 3 window Browser layout that puts the email message to the right of the mail list.

There is no reason to have the pop up button at the bottom of an HTML email.
Please create a separate button for each option, there is plenty of room to have multiple buttons instead of one.

You should also add Color Label assignment to the contextual menu of messages.

Power Mail beach balls when getting new mail, is there a way to make it so it does not lock you out of using the program while it is getting new mail?

Besides these small issues PM is a very fast and reliable mail app. Coming from Claris Emailer, this is very close match and is much better behaved then Apple Mail. And most of all it is very straight forward to back up your mail or quickly switch user accounts, unlike Apple Mail.

This Beta's DMG is not recognized. I sent an email telling them about it, but have not heard back yet.