This example shows how to specify a URL to use as the followup to a form submission.
The following HTML code sends the contents of the Comment field to the address provided in To. Instead of producing the default followup message, which displays the information that was submitted, the URL specified by ctl:followup_url is shown.
<form action="/cgi-bin/mailserf" method="POST">
<input type="hidden" name="hdr:subject" value="MailSerf Followup URL">
<input type="text" name="hdr:to"> To<br>
<input type="text" name="Comment" size="50"> Comment<p>
<input type="hidden" name="ctl:followup_url"
value="http://gromit.callamer.com/mytools/mailserf/ex_furl_reply.html">
<input type="submit" value="Send message">
<input type="reset">
</form>