Here is my (Python)  Script:

mail_text = container.inform_owner(send_to_address='saravan@eas.iis.fhg.de')
mail_host = context.MailHost
mail_host.send(mail_text)


inform_owner is a Page Template and it looks like this:
To:  <span tal:replace="options/send_to_address" />

From:  <span tal:replace="options/send_to_address" />

Subject:  A title

Content-Type:  text/plain; charset=<span tal:replace="here/portal_properties/site_properties/default_charset" />

BODY BODY


  I get error msg 
        Message missing SMTP Header 'From'.

But i am able to use the method,
mail_host.send(msg,from_addr,to_addr,subject)

Can anyone tell me whats going wrong?. I have been trzing to find it for 2 days. without success..

Thanks and regards
Saravanan A