to is mail addresses send to. Multiple
recipients can be specified by putting a comma between each
address in to. This parameter is not automatically encoded.
subject is subject of mail.
message is mail message.
additional_headers is inserted at
the end of the header. This is typically used to add extra
headers. Multiple extra headers are separated with a
Note: Content-Type and Content-Transfer-Encoding headers can be redefined as of PHP 5.0.0. In PHP 4, values defined by mb_language() are always used.
additional_parameter is a MTA command line
parameter. It is useful when setting the correct Return-Path
header when using sendmail.
Returns TRUE on success or FALSE on failure.