Switching away from mutt

After having used mutt for about a decade, I decided it's time I move away from it, for various reasons that I won't go into here.

I've been evaluating thunderbird^Wicedove now for a few weeks, but I can already see I won't keep using it forever, because I find too many issues with it:

  1. I can't tell the thing that I never ever ever want to write HTML-formatted emails. While there is an option "Compose messages in HTML format" in the "Account settings" dialog, that only seems to impact the behaviour of the client upon "new mail", not its reply behaviour, forcing me to go to Options->Format and switch it off.
  2. To make matters worse, the HTML editor and the plain-text editor are not the same dialog. That means it is not possible to switch on HTML formatting if it wasn't on originally (not a problem for me, but I can imagine it being a problem for others), but also that the fugly quoting style (vertical line next to the text) of the HTML editor is not removed when you switch from HTML to plain-text. Further on, it has issues when you want to remove white space, where it will remove entire quoting levels rather than just an empty line. This is horrible, horrible behaviour.
  3. While there is support for multiple email addresses connected to the same IMAP account, it does appear that there is no support for automatically choosing the right email address based on user-defined rules, such as "which mail folder are we currently in". Having to remember that I need to select the right mail address is tiresome and error-prone; e.g., when I'm in a Debian-related mail folder, I want my mail client to use my Debian mail address automatically. It appears the only way in which icedove can automatically select sender addresses is by checking the recipient list in the To: and Cc: headers for any of its configured mail addresses, and using that to decide what to put in the from: header.

Any one of the above would eventually be enough for me to grow tired of icedove and switch to something else; but the three combined mean that I'll be looking for something else fairly soon.

Suggestions are, of course, welcome.