[exim] Allow STARTTLS after HELO

Hi

We have set up exim to allow encrypted connections.
This works fine if the client uses EHLO.
But if the client uses HELO and then sends STARTTLS,
exim responds with "STARTTLS command used when not advertised".

Is there a way to allow STARTTLS even if the peer host
used HELO instead of EHLO?

I'm not sure if EHLO is mandatory according to the RFC,
but apparently other MTAs have no issue with this.

How can this be done in exim?

BTW:
This is used in the config:

tls_advertise_hosts = *

Thanks
David