Message Composition

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Send Later Requires Restart Featured

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (158)
80,171 users

Signature Switch Requires Restart Featured

Switch the signature on/off or choose a new one from your predefined set.

Rated 4 out of 5 stars (209)
63,287 users

Send Later Button Requires Restart Featured

A simple button to invoke the (already existing) send later functions.

Rated 3 out of 5 stars (4)
11,391 users

ThunderHTMLedit Requires Restart Featured

Thunderbird HTML editor. This add-on adds a HTML tab to the composition window where you can see and edit the HTML source of the message.

Rated 5 out of 5 stars (20)
8,762 users

Grammar Checker Requires Restart Featured

Checks grammar using LanguageTool.

Rated 4 out of 5 stars (14)
8,409 users