How to show each recipient's address only once when sending bulk emails.

admin

For example, I will send the same email to 20 people, if you add them all as recipients. So each recipient can know who I sent it to. If one person adds me as a recipient, others will receive the message with my email address added in the subject line as a@a.com. This may be considered spam. Of course, we could send it one by one. That would be too stupid. Is there any better way? Although I'm sending an email on behalf of a group, only the recipient's email address is shown when they open the email and view the sender's email address in their mailbox. They cannot see my email address. The message is not delivered to them but ends up being deleted or automatically marked as spam.