The above email shows bad etiquette. It is sent to several people, which is OK, but their email addresses are all displayed, which is not OK. (I have added blur so not to make them even more public). Someone can easily use the email list to send spam to everyone on it.
The proper way is to create a contact group in your email program and then put that group in the Bcc field. Why not in the To field? If it is, all the addresses will be revealed.
What do you put in the To field, then? The best would be to have each individual recipient appear, as here:
How that is done I don’t know, but I am trying to find out. When I do I will update this post. Till then, create yourself a dummy email address and use that. You may use an address with the same name as the group, as here: