Mail functions

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# XLIX. Mail functions

# Introduction

The mail() function allows you to send mail.

# Requirements

No external libraries are needed to build this extension.

# Installation

There is no installation needed to use these functions; they are part of the PHP core.

# Runtime Configuration

The behaviour of these functions is affected by settings in `php.ini`.

Table 1. Mail configuration options

Name | Default | Changeable
--- | --- | ---
SMTP | "localhost" | PHP_INI_ALL
smtp_port | "25" | PHP_INI_ALL
sendmail_from | NULL | PHP_INI_ALL
sendmail_path | DEFAULT_SENDMAIL_PATH | PHP_INI_SYSTEM

For further details and definition of the PHP_INI_* constants see ini_set().

Here is a short explanation of the configuration directives.

`SMTP` string

  Used under Windows only: DNS name or IP address of the SMTP server PHP should use for mail sent with the mail() function.

`SMTP` int

  Used under Windows only: Number of the port to connect to the server specified with the `SMTP` setting when sending mail with mail(); defaults to 25. Only available since `PHP` 4.3.0.

`sendmail_from` string

  Which "From:" mail address should be used in mail sent from PHP under Windows.

`sendmail_path` string

  Where the sendmail program can be found, usually `/usr/sbin/sendmail` or `/usr/lib/sendmail`. configure does an honest attempt of locating this one for you and set a default, but if it fails, you can set it here.

  Systems not using sendmail should set this directive to the sendmail wrapper/replacement their mail system offers, if any. For example, Qmail users can normally set it to `/var/qmail/bin/sendmail` or `/var/qmail/bin/qmail-inject`.

  qmail-inject does not require any option to process mail correctly.

# Resource Types

This extension has no resource types defined.

# Predefined Constants

This extension has no constants defined.

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