I can group emails that I receive into different priorities, the highest priority is for instance reserved for emails that concern my websites and servers. Messages that inform me about server, database or website downtimes for instance have the highest priorities while confirmation orders from Amazon have not. There is however no option in Thunderbird to configure extra notifications or alerts for specific emails. Users who want to receive notifications for important emails can use the Thunderbird extension Mailbox Alert to do so.
Mailbox Alert works on the folder level which means that it works best if a distinct folder structure exists already as it would not make sense to configure alerts for the inbox unless it only catches high priority email messages by default.
New notifications are configured with a right-click on an email folder in Thunderbird and the selection of Mailbox Alert from the context menu.
Three actions or notifications are available. It is possible to show a message, play a sound or execute a command. Messages are configurable with macros to customize them. It is for instance possible to add the name of the sender to the notification.
Commands can be executables which can also be combined with available macros.
Two additional options are available to configure alerts for child folders and to block alerts for the child folder if alerts for a parent folder are already configured.
The full list of macros is available by clicking on Help in the configuration menu. The developer page contains additional information and a handy third party program to display popups in Windows when priority mail arrives.
The Thunderbird extension itself is offered at the official Mozilla website. It is compatible with Thunderbird 1 to 3.1.
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