#39507 [Opn]: concurrent attempts to connect to SMTP relay fail miserably

ID: 39507 User updated by: rherror404 at gmail dot com Reported By: rherror404 at gmail dot com Status: Open Bug Type: Mail related Operating System: Windows PHP Version: 5.2.0 New Comment: I have found a work-around (not a fix). Do not rely upon the current mail() (at least under the Apache WinNT MPM) to be of any use for the case where more than one mod_php script is forwarding a message to an SMTP relay host. Have the mod_php script spawn a child process that takes a bit of serialized state via its STDIN and let the new process do the mail() work. See the proc_open() docs. If you have serious volumes of mail to send, either do it from a Linux box or find some other way to do it from your Windows box. Calling mail() under Windows/Apache/PHP for anything close to that (as it stands) is not advisable. Previous Comments: ------------------------------------------------------------------------ [2006-11-14 16:14:10] rherror404 at gmail dot com I suspect this may be the same bug mentioned in #31676. My best guess is that this is related to multi-threading. ------------------------------------------------------------------------ [2006-11-14 04:18:49] rherror404 at gmail dot com <? /* Here it is again, edited slightly to run on a Linux machine so that it has its local sendmail do the work. Concurrent requests to the script were handled quite nicely. The huge difference in this case is the Apache prefork MPM. */ define('EXTRAHEADERS', "MIME-Version: 1.0\r\nContent-type: text/html; charset=iso-8859-1\r\nX-Mailer: PHP\r\n"); define('MAILMSG', "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\"> <html><head><title>foo</title><style type='text/css'> body {margin: 0; font-size: 10pt; font-family: sans-serif, arial; color: #000000; background-color: #ffffff;} </style></head><body><div style='font-size: 12pt; background-color: #ffff00;'>" . date("Y-m-d H:i:s") . "</div> random junk<br />" . str_repeat("afhlkhsad;lfj;lkjsa;lfjasd;lkjf;lkjsad;lkfjsad;lkfjsad;lkfja sd;lfkjasd;lkfjsa;ldf<br />\n", 100) . "</body></html>"); ini_set('html_errors', FALSE); define('MAILTO', 'something@thatworks.com'); // something real $retval = mail(MAILTO, 'foo', MAILMSG, EXTRAHEADERS); echo ( $retval ? 'TRUE' : 'FALSE' ) . "\n\n\n"; exit(); ?> ------------------------------------------------------------------------ [2006-11-14 03:56:24] rherror404 at gmail dot com Is the mail() function sufficiently thread-safe under the Windows MPM (for Apache)? I have to wonder if the two concurrent threads are stepping on each other in their efforts to talk to the SMTP box. ------------------------------------------------------------------------ [2006-11-14 03:51:51] rherror404 at gmail dot com To clarify, the bash snippet should read like this (see below). Line 14 contains the call to mail(). ======================================== $ (curl "http://192.168.1.2/error.php" &); (curl "http://192.168.1.2/error.php" &) $ Warning: mail(): SMTP server response: 503 5.0.0 foo.bar.com Duplicate HELO/EHLO in C:\Program Files\Apache Group\Apache2\htdocs\error.php on line 14 FALSE Warning: mail(): Failed to Receive in C:\Program Files\Apache Group\Apache2\htdocs\error.php on line 14 FALSE $ ------------------------------------------------------------------------ [2006-11-13 23:33:06] rherror404 at gmail dot com s/on line 107/on line 14/g ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/39507 -- Edit this bug report at http://bugs.php.net/?id=39507&edit=1