note 70749 added to function.mail

I had trouble getting multiple emails sent for Outlook accounts (a single PHP page performed 2 mail() calls). The PHP mail() function works correctly, but the same mails that were recieved on a private POP3 server were randomly missing by our intranet Outlook exchange server. If you have the same problem, try to verify that the "Message-ID: " is unique at the $headers string. i.e. <?php $headers = [...] . "Message-ID: <". time() .rand(1,1000). "@".$_SERVER['SERVER_NAME'].">". "\r\n" [...]; ?> (rand() is used only for demonstration purposes. a better way is to use an index variable that increments (i++) after each mail) I noticed that when multiple messeges were sent simultaneously, the message-id was the same (probably there was no miliseconds differential). My guess is that Outlook is collating messages with the same message-ID; a thing that causes only one email to pass to the Outlook inbox instead of a few. ---- Server IP: 216.194.113.175 Probable Submitter: 132.74.99.84 (proxied: 132.74.7.65) ---- Manual Page -- http://www.php.net/manual/en/function.mail.php Edit -- https://master.php.net/note/edit/70749 Del: integrated -- https://master.php.net/note/delete/70749/integrated Del: useless -- https://master.php.net/note/delete/70749/useless Del: bad code -- https://master.php.net/note/delete/70749/bad+code Del: spam -- https://master.php.net/note/delete/70749/spam Del: non-english -- https://master.php.net/note/delete/70749/non-english Del: in docs -- https://master.php.net/note/delete/70749/in+docs Del: other reasons-- https://master.php.net/note/delete/70749 Reject -- https://master.php.net/note/reject/70749 Search -- https://master.php.net/manage/user-notes.php