Lost 'action' buttons
Lost SEND button and ADD ATTACHMENTS button on Thunderbird. How do I restore?
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Can you submit a screen shot of your outgoing email composition screen, with a complete address entered in the To field, so we can see what's missing? Add image button is below Post a Reply.
The first section in this article may help https://support.mozilla.org/en-US/kb/hyperlinks-in-messages-not-working