Campaign emails not being recieved

i have a question regarding an email campaign using the new version of phplist.
I sent out 11,000 emails but only about 1,000 emails were opened and only one email was invalid…the rest were unaccounted for. I am trying to figure out what happened to the rest of the emails.could this be a domain or server issue? any feedback welcome. thank you

Hi, it sounds to me like you might find the service easier to use. Self hosting phpList is quite advanced work which takes time and skills. Sorry I don’t know they answer to your question though