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+====== PHP mail and ISP relays ======
+This did my head in so I thought it worthy of a small write up.
+Here the problem: //I wanted to send an email from a DRUPAL 5.12 site hosted on a home linux configured with sendmail/postfix and a SMART RELAYHOST.//
+Sounds simply enough.
+Here is my simple test program in PHP to send an email.
+<code php>
+<?php
+$Name = "Da Duder";
+$email = "dude@duder.com";
+$recipient = "yo@company.com";
+$mail_body = "The text for the mail...";
+$subject = "Subject for reviewer";
+$header = "From: ". $Name . " <" . $email . ">\r\n";
+mail($recipient, $subject, $mail_body, $header);
+?>
+</code>
+Doesn't get easier than that.  Now this is where the fun starts.  If you look at the mail log.
+<box 80% green round>Mail log says //postfix//.  I thought the problem might have been to do with my sendmail configuration so I installed postfix.  It turns out that it wasn't related both suffer from the same fate.</box>
+**/var/log/maillog**
+<code>
+Dec  3 16:05:53 elmo postfix/pickup[13979]: 06BCA92EE80: uid=48 from=<apache>
+Dec  3 16:05:53 elmo postfix/cleanup[14081]: 06BCA92EE80: message-id=<20081203160553.06BCA92EE80@elmo.local>
+Dec  3 16:05:53 elmo postfix/qmgr[13980]: 06BCA92EE80: from=<apache@elmo.local>, size=330, nrcpt=1 (queue active)
+Dec  3 16:05:53 elmo postfix/smtp[14083]: 06BCA92EE80: to=<yo@company.com>, relay=smtp.blueyonder.co.uk[195.188.53.60]:25, delay=0.21, delays=0.06/0.02/0.07/0.06, dsn=2.0.0, status=sent (250 OK id=1L7sEh-0000Yg-Kl)
+Dec  3 16:05:53 elmo postfix/qmgr[13980]: 06BCA92EE80: removed
+</code>
+You see that the envelope-sender is actually **apache@elmo.local** this address is checked by **yo@company.com** spam's filter says "Hay that not valid I'll reject that".
+So what you need to do is tell sendmail that it should use the "from:" as the envelope sender too.
+Small modification to the PHP and this is done.  Why did that take me an hours to figure out?  God only knows.
+<code php>
+mail($recipient, $subject, $mail_body, $header,'-f'.$email);
+</code>
+So back to DRUPAL the PHP **mail()** function is wrapped by the function **drupal_mail()** in the **includes/common.inc** file.
+So we tweak the invokation like so:
+<code php>
+function extract_email_from($string){
+  preg_match_all("/[\._a-zA-Z0-9-]+@[\._a-zA-Z0-9-]+/i", $string, $matches);
+  return $matches[0][0];
+}
+function drupal_mail($mailkey, $to, $subject, $body, $from = NULL, $headers = array()) {
+.. snip ..
+    return mail(
+      $to,
+      mime_header_encode($subject),
+      str_replace("\r", '', $body),
+      join("\n", $mimeheaders),
+      '-f '.extract_email_from($defaults['From'])
+    );
+}
+</code>
+Reference: http://drupal.org/node/131737, http://codesnippets.joyent.com/posts/show/179
+{{tag>mail}}