[exim] acl dnslists in external file doesn't work?

Hello *,


given:

    acl_check_mail:

        ...

        deny    message = blacklisted
                dnslists = dynablock.njabl.org

works, but

        deny    message = blacklisted
                dnslists = /etc/exim/dns.blacklist

with dns.blacklist containing exactly one(!) line 'dynablock.njabl.org'
doesn't work.

My own stupidity, or bug, or feature?
(exim 4.51)

    Best regards from Dresden
    Viele Grüße aus Dresden
    Heiko Schlittermann
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