HAL0THANE  This is the single most important Mail.app bundle you can install to increase your productivity in the app you spend so much time using. Fast, easy, and unobtrusive, Letterbox is a beauty for keeping your attention where it should be: on the message.

An idea I'd like to see, though, is switching the 2nd and 3rd column so that the middle column (center) is the message -- it's where the focus is visually, and so it should be where you focus on the most important stuff.  
(Version 0.24b5)

DR. GIRLFRIEND  Yes! It's working perfectly! Why couldn't Apple have this setting as default in the first place?

Thank you, Aaron Harnly!  
(Version 0.24b5)

KANKEI71  Thanks to the developer. This makes Mail.app really much better.  
(Version 0.24b5)

WALTERMAX  I don't usually write reviews, but this one is too good. I have been using Letterbox for several months now and can't imagine being without it. It, indeed, takes advantage of wide screen and provides a great reading space for email.  
(Version 0.22b)

PSYCHOS  Letterbox allows sending anonymous data, which is okay with me. However, in the list of data to send, it shows a UUID.

So my question is whether this UUID is always the same for a given installation, or if it's uniquely generated for each anonymous data send. (I'm not okay with sending data if the UUID stays the same, because it's really not anonymous anymore at that point.)  
(Version 0.24b4)

SUPERKONNA  If this type of plug-in didn't exist I would use some other mail app. I like Apple's Mail but the lack of vertical view is plain weird. Kudos to the developer.   
(Version 0.24b5)

DOKTER_MAC  I'm very happy to say that this great 'mailplugin' also works fine on PPC Macs!!!

I've just installed version 0.22, since I'm running Mac OS 10.5 on a PowerMac G5.

-Installation on PPC Mac running 10.5 without any problems!

-First launch of the Mail app and everything works just fine!

-Preferences are all working!

-Auto Update works also!

-In short, everything works just fine like it should be! On both architectures :-) ...

To the developer: Could you please correct the requirements from Intel to PPC/Intel.

You've made a lot of PPC users very happy with this mailplugin!!!

I'll write a complete 'review' when I used the plugin a couple of months. But for now 5 stars!!!

With kind regards.  
(Version 0.24b5)

PSYCHOS  Feature suggestion: It would be awesome to have multiple message lists available. That is, multiple copies of the mailbox list (if open) + message list on the left (with a separate columns header for each message list if possible, preferably toggleable), with a single preview pane on the right. You should be able to drag the message list separators to resize them. Things like individual sorting/threading options for each would be nice.

I'd love to be able to have, say, 3 message lists open: One sized to about 60% vertical height for work email, one sized to 25% vertical height for personal email, and one sized to 15% vertical height for non-important work email (automated notifications and such.)

I currently manage this by using rules to set background colors for different categories of work/personal mail (viewed as a unified inbox of two IMAP accounts), and I don't even bother displaying the non-important work mail since the volume is too great to mix it in with my inboxes, but if I could have a non-intrusive view of it taking just a bit of space, that'd be nice. This, of course, results in an interleaved view; what I want is a non-interleaved view of multiple message lists, each sorted separately.

Oh, and another feature suggestion, as if I wasn't already asking too much: A From/To column. Or, just the ability in the "From" column to have it display like "To: " if it's a sent message (or however else this can be matched if possible.) I like to display my sent mail with my inboxes as well, which I also color code. But it'd be nice to be able to see the recipient of sent mail in the same "From" column, rather than just see that it's from me.

I could accomplish this through a couple of different hacks, such as having a script on my IMAP server copy sent mail into an archival mailbox for the original, then rewriting the From to "To: xxx" in the main sent mailbox. Or perhaps creating a Smart Mailbox and using an Applescript to do the same. But it'd be nice to just have a simple way to do it.  
(Version 0.24b4)

SEVEN19  I absolutely love this Plugin & cannot stand Mail.app without it, So happy there's a 10.6 release available! Letterbox is a MUST HAVE!  
(Version 0.24b4)

PENGMAN  Another one of my indispensables.

Sure missed this after upgrading to Snow Leopard. Beta version seems very stable.

Mail is now much, much better.

This man deserves donations.  
(Version 0.24b4)