迭代复选框，发送电子邮件和循环

We're trying to send multiple emails at once to a list of companies, where an email can be checked or unchecked. If the email is checked, it needs to be sent to them. I've managed to get it to send the email to each email address ticked, but we want it to be one at a time. IE, rather than sending one email to Contact1, Contact2, Contact3 all in one go, we want to send one email to Contact1, loop through and then send the same email a second time to Contact2, and so forth.We're trying to send multiple emails at once to