Here's a short explanation of the configuration directives.
SMTP string
Used under Windows only: host name or IP address of the SMTP server PHP should use for mail sent with the mail() function.
smtp_port 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. This directive also sets the "Return-Path:" header.
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.
This directive works also under Windows. If set, smtp, smtp_port and sendmail_from are ignored and the specified command is executed.
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