These are a ready make selection of some of the most popular buttons from the Custom Toolbar Button Maker

Thunderbird, Postbox

Unread Threads

View Unread Threads

View threads that you have not read yet.

Compatibility: Thunderbird, Postbox SeaMonkey

Account Setup

Run wizard to setup a new account

Run Account Wizard to set up a new account in Thunderbird.

Compatibility: Thunderbird, Postbox SeaMonkey

Add Email

Copy Email Address to Address Book

Add a new email address to the address book.

Compatibility: Thunderbird, Postbox SeaMonkey

All Threads

View All Threads

View all the threads in the current folder, not just unread or some other sub set.

Compatibility: Thunderbird, Postbox SeaMonkey

Delete Events

Delete Selected Events

Delete an event.

Compatibility: Thunderbird, Postbox SeaMonkey

Delete Tasks

Delete Selected Tasks

Delete a task.

Compatibility: Thunderbird, Postbox SeaMonkey

Edit Draft

Edit Saved Draft or Message

Edit a message that you have saved as a draft.

Compatibility: Thunderbird, Postbox SeaMonkey

Email Headers

Toggle what email headers show

Sets what headers are displayed for an open message.

Compatibility: Thunderbird, Postbox SeaMonkey

New Event

Add a new event to the calendar.

Add a new event into the calendar.

Compatibility: Thunderbird, Postbox SeaMonkey

New Task

Add a new task to the calendar.

Add a new task to the calendar.

Compatibility: Thunderbird, Postbox SeaMonkey