Here is how I would do it:
- Store the users emails in a database
- Query to get all the emails
Then do this:
while(THE VARIABLE THAT WILL LOOP TO GET EMAILS, call it $var1)
{
mail($var1, 'subject', 'message', 'headers');
}
It will email everyone. That's not as efficient as most newsletter scripts are, but it's a simpe solution.