[Exim] require helo

Hi!

Is there a way to make exim 4 accept a smtp-session only if it
starts with HELO/EHLO from the client? With the current config the
client is allowed to start with "MAIL FROM:".
Next point: The HELO/EHLO must not be verified (There are too many
broken dns entries... )

Pointer to the relevant parts of the docs will be enough. :-)

\\// christoph
:wq