Because a Gmail just has 100 emails per day quota, then you need to add one or more editors to your sheet and log to one of them to send more email using "Sheet Easy Mail Merge" add-on.The default senders of the email now difference. If you need to send emails from unique email adress, let add that email as the alias of other editors.
With the newest version of the add-on, you can select the sender's email adress from aliases. So you can add more and more Gmails (with your main email was set as alias) to send thousands of emails per day from the unique email address with the "send from alias" feature of the add-on.
