In order to make sure that your emails won't end up in the Spam box OR completely refused and blocked by receiving email server, you need to configure DKIM records as described here
https://docs.acymailing.com/setup/configuration-1/mail-configuration/dkim
Please also be sure to check the article related to the spam issues and go through the list of suggestions on how to best configure your server in order to make your emails spam-free
https://docs.acymailing.com/faq/spam-issue
You are using PHP mail functions as a sending method in your AcyMailing Configuration
It is virtually impossible for us to debug this sending method because we don't receive any kind of feedback from it. That function just forwards your email to the underlying email server and that is it. In order to see what is going on and why your emails are not delivered or why spam test is not working, you should do one of the following:
- contact your hosing support and ask them to inspect email server logs. They might tell you why the emails are not delivered
- use an external server as your sending method. Configure SMTP server and use it instead. That will give you possibility to test the whole sending path and see what is going on
