For the Mail functions to be available, PHP must
have access to the sendmail binary on your system during
compile time. If you use another mail program, such as qmail or postfix, be sure to use the appropriate
sendmail wrappers that come with them. PHP will first look for
sendmail in your PATH, and then in the
It’s highly recommended to have sendmail available from your
PATH. Also, the user that compiled PHP
must have permission to access the sendmail binary.