SMTP (Windows only)
smtp_port (Windows only)
sendmail_from (Windows only)
If you are going to be writing and deploying PHP scripts that generate and send email messages, you need to know something about how email gets delivered around the Internet. This will help you better understand and support your customers when problems arise. Figure 8.1 shows the main components of the email architecture.
Figure 8.1. How email is delivered.
Here are the standard ...