[Exim] hosts_avoid_tls unknown in exim 4

Hello list,

I wanted use the hosts_avoid_tls = /etc/exim/no_tls.txt
in my dnslookup router.

dnslookup:
driver = dnslookup
domains = ! +local_domains
transport = remote_smtp
ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
hosts_avoid_tls = /etc/exim/avoid_tls
no_more

But when starting exim it failes because of unknown option.

Thanks for any help in advance.

Thomas

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Thomas Baumann // tirili+list.exim@???