Answering the steps by number:
1) I use your plugin for almost 4 years so no need to make new template
2) The testmail or also the confirming mail after sending the weekly newsletter I don not receive anymore for a few years
3) I send you screenshots of what I see, since end of August it is not working well
4) Every week I have a completely new post
Hope you can help me solve this problem, because it worries me a lot!