PHP script returns Warning: mail(): "sendmail_from" not set in php.ini or custom "From:" header missing

如果發生

PHP script returns Warning: mail(): "sendmail_from" not set in php.ini or custom "From:" header missing

解決方式:

ini_set("sendmail_from"," name@yoursite.com");
ini_set("SMTP","mail.yoursite.com");

sendmail from 後面的網域請確定是真的存在的。