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PHP’s mail function seems to deliver mail on a clean system, with no apparent configuration done by the administrator or webmaster (no SMTP configuration in php.ini, etc.). How does the mail function deliver mail to a remote server?
On *nix it invokes the
sendmailbinary, which then uses the mail configuration to route the email. On Windows, it sends to a SMTP server. In both cases the sysadmin sets up the mail system.