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+<?php  
+/*
+ *  Proof General mailing list subscription and unsubscription.
+ *  
+ *  David Aspinall, June 1999.
+ *
+ *  $Id$
+ *
+ */
+
+  require('functions.php3');
+  if ($subscribe == ""):
+##
+## Subscription form
+##
+  small_header("Proof General Mailing List"); 
+  ?>
+<p>
+The mailing list address is 
+<a href="mailto:users@proofgeneral.org">
+<tt>users@proofgeneral.org</tt>.
+</a>
+</p>
+  
+<p>
+To subscribe or unsubscribe, you can fill in the form below.
+<br>
+Or send a message to 
+<a href="mailto:majordomo@proofgeneral.org">
+ <tt>majordomo@proofgeneral.org</tt>
+</a>
+with the words "<tt>subscribe proofgeneral</tt>"
+(or "<tt>unsubscribe proofgeneral"</tt>) in the message body.
+</p>
+
+<p>
+Since its beginning, the mailing list has been a low-volume list (one
+message every few months).  If the volume increases significantly due
+to user interaction, we will introduce a separate mailing list for
+announcements.  
+</p>
+
+<h2>Mailing list subscription</h2>
+
+<form method=post action="<?php echo $PHP_SELF; ?>">
+<table width="300" border="0" cellspacing="2" cellpadding="0">
+<tr>
+ <td width="30%">Your name:</td>
+ <td width="70%"><input type=text name="name" size="40"></td>
+</tr>
+<tr>
+ <td width="30%">Email address:</td>
+ <td width="70%"><input type=text name="email" size="40"></td>
+</tr>
+<tr>
+ <td width="30%"><input type=radio name="subscribe" value="yes" checked></td>
+ <td width="70%">Please add me to the mailing list.</td>
+</tr>
+<tr>
+ <td width="30%"><input type=radio name="subscribe" value="no"></td>
+ <td width="70%">Please remove me from the mailing list.</td>
+</tr>
+</table>
+<input type=submit value="Send request"> 
+</form>
+<p>
+</p>
+<?php  
+  click_to_go_back();  
+  footer(); 
+
+  else:
+##
+##  Process subscription
+##
+   $title = ($subscribe == "yes" ? "Subscription" : "Unsubscription") . " Request";
+   small_header($title);
+
+   $request = ($subscribe == "yes" ? "join" : "be removed");
+   
+   $message = ($subscribe == "yes" ? "subscribe " : "unsubscribe ") 
+		. "proofgeneral"; 
+   mail("majordomo@dcs.ed.ac.uk",
+	"[Web form from ~proofgen]",
+	$message,
+        "Reply-To: " . $email . "\nFrom: " . $email);
+
+   if ($from != "") { print "<p>Dear " . $from . ",</p>\n"; };
+   print "<p>";
+   print "Your request to " . $request . " the proof general mailing list has been submitted.<br>";
+   print "Thank-you!";
+   print "</p>\n<p>";
+
+   click_to_go_back();
+  
+   footer();
+ endif;
+?>
+