I expect to sent a newsletter to a list of about 1000 recipients but the process doesn't work, no messages is sent. Here is the rapport of the company where the web site is hosted: "While the configuration in your script looks correct, it would seem that there is some error in the coding that it is not setting the "From" address sent to PHP mail() correctly. You may need to contact the code developer/maintainer about this."

My version project is 6.17.