forgot a few files in last push.

signup/_probe.php

@@ -0,0 +1,9 @@
+<?php
+$cmd='/usr/bin/sendmail.postfix -t -i -f [email protected]';
+$ds=[0=>['pipe','r'],1=>['pipe','w'],2=>['pipe','w']];
+$p=proc_open($cmd,$ds,$pipes);
+fwrite($pipes[0],"To: [email protected]\r\nSubject: proc_open test\r\n\r\nhi\r\n"); fclose($pipes[0]);
+$stdout=stream_get_contents($pipes[1]); fclose($pipes[1]);
+$stderr=stream_get_contents($pipes[2]); fclose($pipes[2]);
+$rc=proc_close($p);
+var_dump(['rc'=>$rc,'stderr'=>$stderr,'sendmail_path'=>ini_get('sendmail_path')]);