The Domain Name System (DNS) allows to use domain names (e.g. yahoo.com) in place of the corresponding IP address, such as 192.0.32.166.

The domain names and their complementary IP addresses are stroed on domain name servers, which are interspersed across the globe.

1. SMTP=string, Scope:PHP_INI_ALL
2. sendmail_from=stirng, Scope:PHP_INI_ALL
3. sendmail_path=string, Scope:PHP_INI_SYSTEM
4. smtp_port=integer, Scope:PHP_INI_ALL
5. mail.force_extra_parameters=string, Scope:PHP_INI_SYSTEM

The PHP mail() function is used to send emails from inside a script.

Prototype:

boolean mail(string to, string subject, string message [, string addl_headers [, string addl_params]])

Parameter
Description
to
Required. Specifies the receiver / receivers of the email
subject
Required. Specifies the subject of the email. Note: This parameter cannot contain any newline characters
message
Required. Defines the message to be sent. Each line should be separated with a LF (\n). Lines should not exceed 70 characters
headers
Optional. Specifies additional headers, like From, Cc, and Bcc. The additional headers should be separated with a CRLF (\r\n)
parameters
Optional. Specifies an additional parameter to the sendmail program


Example:

<?php
   
    mail("client@example.com","This is a subject","This is the mail body","from:admin@example.com\r\n");

?>

1. HTTP - Hyper Text Transfer Protocol
2. FTP - File Transfer Protocol
3. POP3 - Post Office Protocol
4. IMAP - Internet Message Access Protocol
5. SSH - Secure SHell