Good system, but…

It’s a good system for sending newsletters. The free version allows the graphic creation of newsletter content in an easy and impressive way. Great statistics on openings of emails sent and how many people clicked on the links you put in the emails. I would have put 5 stars but I asked them a question and they didn’t answer: newsletters (in the free version) are sent with the sender corresponding to the mail I set in the panel. If many people who receive it put the newsletter in the spam folder, do I run the risk of having my mailbox blacklisted? Why isn’t the sender a dummy email so as to prevent this risk (as I have seen other providers do)?