How to send letters to all the recipients at once Apple Mail? I have 100 open emails in Apple Mail. There will be one recipient for each email. Such a requirement is very important to me and can't be changed.

How can I automate the process of sending these emails with one or two clicks? I prefer not having to press 'Send' 100 times.
The send shortcut is ⇧⌘D. Hold this down to send the emails.