The problem was solved by the creation of the PHP mail()-function.
Programmers have to include the receiver or receivers, subject, message, header (From, Cc, and Bcc) and optional parameter of the eMail.
The syntax of the mail()-function is mail(to,subject,message,headers,parameters)
.
For an example, see "Screenshot PHP Mail-Function" or the following code-snippet:
<?php
$to = "somebody@example.com";
$subject = "test subject";
$txt = "Hello world!";
$headers = "From: from@example.com" . "\r\n" .
"CC: cc@example.com";
mail($to,$subject,$txt,$headers);
?>