Rated 1 out of 5 stars

by Aergia Flexed on July 10, 2025 ·

I'm not sure I understand what this button is supposed to do. Here's why I'm saying that:

I'm running Thunderbird version 138.0.2 (64-bit) and installed both the Send Later add-on and the Send Later Button add-on. Everything appeared to work fine in my tests and I assumed the button in the upper right area of the message I was composing was THE button associated with the Send Later Button add-on.

A couple days later I was trying to send a group message and got a "User Unknown" error. It happened regardless of what outgoing mailserver I used. I could not send group messages. I couldn't find any satisfying explanation for why this was happening and definitely no fix for it. So I started doing the typical uninstall of recent additions, starting with the Send Later Button Add-On for Thunderbird. Immediately the problem went away. No idea why. But the really weird thing is that although the Add-On was disabled, I still showed a Send Later button in the upper right when composing a message. And the regular Send Later Add-on system still worked.

The description at github says:

"This addon adds a button to the toolbar of the compose window that allows you to utilize the send later functionality of Thunderbird even if you are in online mode"

But I find that to be the case whether the Add-on is enabled or disabled. So, what in fact is the Button add-on for? And regardless, beware of the group mail conflict.

This user has a previous review of this add-on.

Rated 5 out of 5 stars

by -Gonzo- on Aug. 7, 2024 ·

Ich verstehe nicht, warum dieser Button nicht grundsätzlich in Thunderbird verfügbar gestellt wird!

Ich habe in Outlook schon seit Jahren das sofortige Senden abgestellt und lese meine Mails im Postausgang nach einigen Minuten Abstand zum Thema erst nochmal durch.

Denn oftmals sehe ich dann plötzlich Schreib- oder Grammatikfehler, weil Sätze wg. geänderter Gedankengänge umgestellt wurden ... oder es fällt einem noch was ein ... da ist es echt von großem Vorteil, wenn die (peinliche) Mail noch nicht gleich raus ging!

This review is for a previous version of the add-on (1.2.2).