Thunderbird 122 adds a new "messagesUpdate" permission which is required by Send Later. This release adds the required permission to the add-on manifest.
Also, Italian translation updates.
Note: Downloading and installing send_later_beta.xpi will subscribe you to future beta releases. We love beta-testers! The advantage is that if there's a bug that affects your workflow you'll help find it and get it fixed quickly. The disadvantage is that bugs are a bit more likely in beta releases. You can unsubscribe from beta releases at any time by downloading and installing send_later.xpi or installing from addons.thunderbird.net.