[web2py] GAE and sending email

[Gary Bee]

I am successfully sending an email from my web2py app hosted on GAE:

 mail.send(to=['webs...@rtplanb.com'],reply_to=form.vars.email,
               subject=form.vars.Name+' from '+form.vars.Organisation
+' Website Enquiry ',
               message=form.vars.email+' wrote '+form.vars.Enquiry)

My problem is that when I get the email the reply to field seems to be
ignored? I have added the website visitors email to the message to get
around this but it isnt ideal.
Any ideas?