[Exim] Q: TLS not for all servers?

TLS works fine..... for _nearly_ all servers, in and out.

But connections to one mailserver (sun) don't work
(
error:14077410:SSL routines:SSL23_GET_SERVER_
HELLO:sslv3 alert handshake failure
)

How can I prevent exim from trying to _deliver_ via TLS to some specific
hosts?

d.