I am also not receiving any newsletter that I sent to myself. My last successful attempt was on October 14. Has anything changed in the system since?
I tried to change the sender email address to be the same domain as edm.myshopperfeedback.com.au (i.e. using email@example.com which I jusst set up) but it still failed but without extra info like the message on the “Read more” line.
Please help as I urgently need to send out newsletters and I am new to this plugin. Many thanks in advance!