Code: Pertinent PHP Settings: SMTP: localhost sendmail_from: None sendmail_path: /usr/sbin/sendmail -t -i Diagnostic Results: No errors were returned while attempting to send the email. Check firstname.lastname@example.org shortly to confirm you've received the email. If you don't receive the email, try sending the test to a different address. If that fails, check your mail server's configuration. But in fact I never received eMail on email@example.com I have no clue, please help me fix this issue, it's emergency because the server is on production site. I tried to use sendmail -f but also not worked. I posted this issue to Support Ticket already.