No idea, I just think it's to damned bulky. I mean don't get me wrong here, it has it's uses now and then, and it looks pretty and all, but when it comes down to it, I'll personally select from a list like this:

gore's list of OK and good email clients that don't suck as much:

K mail - K mail has a very nice look, a nice interface to it, it's easy to use, has a totally customizable everything for the person (like me) who thinks default looks make coders look like idiots, and for the "I don't care how it looks" person, you can just leave it the way it is.

The Address Book is simple, it works good, and K mail itself has excellent filters. It also works incredibly easy.

The system requirements have gone up a little over the years, but what hasn't? All around I like it. And I can even use it on my crappy test machine. The test machine I use, is totally old:

Intel Celeron Processor, which is 433 MHz, single core from like 10 years ago. 192 MBs of RAM, and an ATI Video card which has a whopping 8 MBs of Video Memory.

If something works on this machine, it's probably pretty neat lol.

Anyway, to continue now:

Novell - Evolution - I do like this. It's nice looking, it has a cool interface, and the old versions that came with older version of SuSE Linux, were awesome, and had really cool features.

Sylpheed / Claws - This is what I generally use on my test machine. It's incredibly low resource, and it works awesome. The interface is nice, and considering the low resource needs of it, it's actually got a LOT of features, and even Themes. I was amazed when I first started using it how good it was. I figured anything with such low resource requirements, would probably be usable, but probably lack a lot of features. Well, this is one that shows that you CAN in fact have a GOOD Email client, that has all the features you'd expect from a modern client, and on top of that, even Themes / Skins, to make it look cooler to you, and easy to set up to boot. I recommend it.

Opera - I don't really care if someone doesn't like Opera. The Web Browser itself is amazing, and looks great, and it's stable. The Email Application built into it, is amazing. I use it every day. It too, works on my horrible slow test machine.
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I'm pretty sure there are more out there, but for Linux / BSD, and only listing the GUI ones, these are usually what I use. For NON-GUI clients, I like these:

Mutt - My favorite Mail Client. The ONLY reason I don't use it now, is because I can't with the ISP I have. That's literally it. I used Mutt for a long time, and LOVED it, and then, one day, my ISP did something to their Email Servers, and I couldn't use it anymore. Because Mutt doesn't Send Mail, it checks mail. You have to use Send mail, Postfix, or something else to send email with it, and you have to use fetchmail or getmail to actually grab the mail. All that and it STILL is my favorite. That tells you something huh? Lol. It tells you that even though the Configuration file is almost 10 MBs of Text, and I use to literally configure my addy book right into it's configuration file, I STILL Loved it. I had an inbox with almost 30,000 emails. And it still loaded up in seconds.

Pine

Elm


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Anyway, that's the clients I use. If you end up looking into Sylpheed, you'll find that it has a twin that uses the SAME configuration files, and so if you set up one, you've set up both lol.

By the way, did you try it yet Coffee cup?