Hi, there are different ways to track the location from where you are sending. In particular, you can search for the IP address from which the email was sent. I learned about this method from this article https://radaris.com/blog/how-to-find-out-where-an-email-came-from/ There are other ways. I think this information will help you.
I had this when my computer caught some virus. Computer specialists at work checked the whole thing and recommended me to change my mailing client to Outlook. So they gave me this https://www.outlookimport.com/de/import-eml-to-outlook/ instruction because they didn't have enough time to do it for me. But all was pretty easy in the end of the day.
To achieve the desired result and reach the largest number of people through email marketing campaigns, you must involve subscribers in your. You will need a transactional email service that allows you to manage your email list, send newsletters and receive feedback from your users. With this platform, you can see how big your mailing list is, when it was created and which links were clicked for a particular message.