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Re:What’s New in Thunderbird 78 by zelphirkalt on Friday July 17, 2020 @04:41AM (#23868525)
Now it needs some visual indication of a complete e-mail address in the To: line. Like a rounded rectangle 1px border around a complete e-mail address and some kind of hint, that you can enter more than one address.
Re:What’s New in Thunderbird 78 by ronjouch on Friday July 17, 2020 @06:06AM (#23868998)
There is a visual indication of a complete email addresses: each correct/complete email address is wrapped in a "pill", a light gray one (see OP screenshot). An incomplete email will similarly get wrapped into a dark red pill.

Your comment maybe indicates the gray is too subtle, or invisible to users with bad eyesight.

Re:What’s New in Thunderbird 78 by zelphirkalt on Friday July 17, 2020 @09:31AM (#23870256)
You are correct! Somehow I did not see that detail. Good that they thought of this.