note 126514 added to function.mail

Avoid starting the email message with "From:" as this will cause the email sending to fail, without an error message. I found this out when emailing some form data, the first line of which was formatted like that. ---- Server IP: 45.112.84.4 Probable Submitter: 45.112.85.242 (proxied: 84.71.158.173) ---- Manual Page -- https://php.net/manual/en/function.mail.php Edit -- https://main.php.net/note/edit/126514 Del: integrated -- https://main.php.net/note/delete/126514/integrated Del: useless -- https://main.php.net/note/delete/126514/useless Del: bad code -- https://main.php.net/note/delete/126514/bad+code Del: spam -- https://main.php.net/note/delete/126514/spam Del: non-english -- https://main.php.net/note/delete/126514/non-english Del: in docs -- https://main.php.net/note/delete/126514/in+docs Del: other reasons-- https://main.php.net/note/delete/126514 Reject -- https://main.php.net/note/reject/126514 Search -- https://main.php.net/manage/user-notes.php