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

Thunderbird, Postbox

Archive Thread

Send the Selected Thread to the Archive

Send the Selected Thread to the Archive

Compatibility: Thunderbird, Postbox SeaMonkey

Create Filter

Create filter from message

Create a message filter from the currently selected message.

Compatibility: Thunderbird, Postbox SeaMonkey

Delete Attachments

Delete All Attachments From Message

Delete Attachments from and email.

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

Detach Attachments

Detach All Attachments From Message

Detach Attachments from an email.

Compatibility: Thunderbird, Postbox SeaMonkey

Email Headers

Toggle what email headers show

Sets what headers are displayed for an open message.

Compatibility: Thunderbird, Postbox SeaMonkey

Filters

Set up Message Filters

Add or edit you current message filters.

Compatibility: Thunderbird, Postbox SeaMonkey

Forward As Attachment

Forward message as an attachment

Forward the current message as an attachment.

Compatibility: Thunderbird, Postbox SeaMonkey

Forward Inline

Forward message as part of the email

Forward the current message as part of the email.

Compatibility: Thunderbird, Postbox SeaMonkey