I actually like Thunderbird since when I discovered MRC Compose extension[0] which provides a UI similar to Outlook in the To, CC and BCC fields. Having to inpu

I actually like Thunderbird since when I discovered MRC Compose extension[0] which provides a UI similar to Outlook in the To, CC and BCC fields. Having to input one by one the email addresses is troublesome in my use case (lots of addresses to manipulate when replying). It's a pity it isn't a default behaviour. [0] https://addons.thunderbird.net/en-US/thunderbird/addon/mrc-compose/ https://addons.thunderbird.net/en-US/thunderbird/addon/mrc-c...