There is no option to clear the search history. It's kept in the claws-mail configuration folder, among those files: quicksearch_history summary_*_history summarysearch_*_history It would be nice to have a such feature.
You can easily create an action to delete or empty those files (or any other you want cleared), in case you're talking about a new menu option. See http://www.claws-mail.org/faq/index.php/Actions for details.
Hi Ricardo, Thanks for the suggestion, but I'm looking for something more automatic. e.g. a checkbox in "Configuration" > "Preferences" or in clawsker that disable the history fully.