Plugin Sendpress and Postman SMTP

I can not send newsletter with sendpress.

To try to solve this problem, I installed the Postman SMTP to configure sending mode, with the Postaman I had success. I can send ONLY test emails to any email server, only test email to any server, but when I send newsletter to my list of subscribers the emails don't arrive.

I want send newsletter (obviously rsrs)

Is there some setting that I can do?

I have the same issue, is there any solution exists?