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Mailbox Alert 0.25.1
Mailbox Alert allows you to specify, for each seperate mail folder, a message, sound and/or a system command that will be executed when new mail is found there. ...
About this Add-on
This way, you specify different actions for less important folders, or no action at all.
Due to the individual folder (or filter) settings, the plugin is configurable with a right-click on an account or folder, not in the main preferences window. Please read https://tjeb.nl/Projects/Mailbox_Alert/Manual/ for more information and examples.
Additionally, while I haven't spent much time on it lately, please send bug reports to me directly. A negative review is fine, but I cannot engage to get bugs fixed through reviews :)