I set up Sylpheed Claws again in my new old laptop. Sylpheed Claws - a fork of Sylpheed - is a cross-platform program that can be used in Gnu Linux and MS Windows. I prefer it to Thunderbird because it's lightweight and uses the maildir format, in which each message gets a separate file, rather than placing all of them in a single file. (If that file gets corrupted, you're in trouble).

Claws is highly customizable. A user manual is available that describes all the things you can do with it and I found a couple of Youtube videos.

One thing that I didn't find easy to do, but which I considered important enough to play with, was setting up a dedicated button in the message view that would move messages quickly into the Archive folder.



That's the button marked "Message/archive" above.

In order to get it there I had to
- go through the Configuration | Actions... dialogue, and create a new "Filter Action";
- edit filter action;
- in the new dialogue box, choose as the action "Move",
- select destination,
- click on ADD button, then,
- back in the Actions Configuration, click on Add,
- click on OK.

After the Action has been created:
- Click on Configuration | Preferences
- Click on Tool Bars, Main Window
- Add a new item by going to Tool Bar Item, choose User Action
- Under Event Executed on Click, choose the "Message/archive" action that was made previously.
- Move the button to the desired position (Up / Down)
- Click Apply.

That's it: there's a new button for archiving messages.
#software-configuration

Source: http://www.vikshepa.com/customizing-sylpheed-claws/