PHP contains two dedicated mail functions, which are built into PHP by default. The mail() function allows for the sending of email directly from a script, and ezmlm_hash() provides a hash calculation useful for interfacing a script to an EZMLM mailing list system.
The mail() function requires an installed and working email subsystem for sending mail. The program to be used is defined by configuration directives in the php.ini file. A common pitfall is that these are not set up correctly, rendering mail() inoperable. Note that the first two directives are for use only on Windows systems; the third is for use only on Unix-type systems.
SMTP: The host to which to connect to send mail. Can be either a fully qualified hostname or an IP address. Used only on Windows systems.
sendmail_from: The email address from which sent mail should appear to have been sent. Used only on Windows systems.
sendmail_path: Full pathname of the mail executable to run when sending mail. This can also include command-line arguments. The default is created during the precompilation configuration: For example, if a sendmail executable is found in /usr/sbin, the default will be "usr/sbin/sendmail -t -i." If no sendmail executable is found, one must be specified here. Used only on Unix-type systems.
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