amavis "fails to parse" 'uridnsbl_skip_domain ...' in spamassassin local config ?

[locuse at mm.st]

hi,

i'm running

	./amavisd -V
		amavisd-new-2.6.6 (20110518)

on Ubuntu 10LTS/64.  it's part of a Zimbra/OSE v7.1.4GA install.

the spamassassin that's bundled with it is,

	./spamassassin -V
		SpamAssassin version 3.3.2
		  running on Perl version 5.10.1

i've customized spamassassin & its local config file (salocal.cf.in) to
use the URIDNSBL plugin, as i have been doing on another standalone (no
amavis) SA system.

checking this system, the module's installed,

	module_info Mail::SpamAssassin::Plugin::URIDNSBL
		Name:        Mail::SpamAssassin::Plugin::URIDNSBL
		Version:     (unknown)
		Directory:   /opt/zimbra/zimbramon/lib
		File:       
		/opt/zimbra/zimbramon/lib/Mail/SpamAssassin/Plugin/URIDNSBL.pm
		Core module: no

it's enabled in "init.pre",

	grep URIDNSBL /opt/zimbra/conf/spamassassin/init.pre
		# URIDNSBL - look up URLs found in the message against
		several DNS
		loadplugin Mail::SpamAssassin::Plugin::URIDNSBL

and, per the module's docs,
	https://spamassassin.apache.org/full/3.3.x/doc/Mail_SpamAssassin_Plugin_URIDNSBL.html

i've added,

	uridnsbl_skip_domain mytesdomain.loc

to my local config.

spamasassin debug lint sees the plugin loaded,

	./spamassassin -D --lint  2> out.txt
	grep -i uridnsbl out.txt
		Apr  6 07:25:58.618 [20650] dbg: plugin: loading
		Mail::SpamAssassin::Plugin::URIDNSBL from @INC
		Apr  6 07:25:58.803 [20650] dbg: plugin: did not
		register Mail::SpamAssassin::Plugin::URIDNSBL, already
		registered
		Apr  6 07:26:05.647 [20650] dbg: plugin:
		Mail::SpamAssassin::Plugin::URIDNSBL=HASH(0x3e87f28)
		implements 'parsed_metadata', priority 0

	./spamassassin -D <sample-spam.txt 2> out.txt
	grep -i uridnsbl out.txt
		Apr  6 08:20:17.159 [21970] dbg: plugin: loading
		Mail::SpamAssassin::Plugin::URIDNSBL from @INC
		Apr  6 08:20:17.773 [21970] dbg: plugin: did not
		register Mail::SpamAssassin::Plugin::URIDNSBL, already
		registered
		Apr  6 08:20:24.521 [21970] dbg: plugin:
		Mail::SpamAssassin::Plugin::URIDNSBL=HASH(0x2bdd298)
		implements 'parsed_metadata', priority 0
		Apr  6 08:20:24.732 [21970] dbg: uridnsbl: domains to
		query:

but at restart of amavis itself

	zmamavisdctl restart

logs show that *amavis* reports that the uridnsbl line in the local
config is FAILing to parse,

	Apr  6 08:28:10 zimbra amavis[19986]: SA info: config: failed to
	parse line, skipping, in "/opt/zimbra/conf/salocal.cf":
	uridnsbl_skip_domain mytestdomain.loc

there's no other warning or error; it's *just* this line, for this
plugin, from amavis.

zimbra community has, so far, been completely silent on the matter. 
irc@#spamassassin suggests that it's an amavis problem.

as i mentioned above, this same config on a !amavis SA installation
works just fine, with no parse error, and URIDNSBL working as expected.

(1) how can i verify that this problem is/isn't an amavis issue?
(2) if it is amavis, what can be done to fix it?

thanks.