help to configure DKIM sign perl script

I am trying to setup the DKIM sign script,
https://www.stalker.com/ScriptRepository/helper_DKIM_sign.pl
and I am getting an error messages:

21:17:23.067 5 EXTFILTER(DKIM_sign) inp(030): * helper_DKIM_sign.pl
started. 21:17:23.175 4 EXTFILTER(DKIM_sign) ENQUEUER-1 starting
initialization 21:17:23.175 5 EXTFILTER(DKIM_sign) out(011): 255 INTF
4\n 21:17:23.175 5 EXTFILTER(DKIM_sign) inp(010): 255 INTF 3
21:17:23.175 2 EXTFILTER(DKIM_sign) interfaceLevel = 3 21:17:23.175 2
EXTFILTER(DKIM_sign) inited 21:17:23.175 5 EXTFILTER(DKIM_sign)
out(025): 256 FILE Queue/70013.msg\n 21:17:23.175 5 EXTFILTER(DKIM_sign)
inp(066): 256 REJECTED can't open Queue/70013.msg: No such file or
directory 21:17:26.004 5 EXTFILTER(DKIM_sign) out(025): 257 FILE
Queue/70026.msg\n 21:17:33.175 5 EXTFILTER(DKIM_sign) out(025): 258 FILE
Queue/70013.msg\n 21:17:33.176 5 EXTFILTER(DKIM_sign) inp(066): 258
REJECTED can't open Queue/70013.msg: No such file or directory
21:17:35.000 1 EXTFILTER(DKIM_sign) request 257 timed-out 21:17:35.000 2
EXTFILTER(DKIM_sign) killing the external program 21:17:35.000 3
EXTFILTER(DKIM_sign) failed(will retry): FILE Queue/70026.msg. Error
Code=external helper timed out 21:17:35.001 1 EXTFILTER(DKIM_sign)
reading failed. Error Code=bad file descriptor 21:17:35.001 1
EXTFILTER(DKIM_sign) reading failed. Error Code=bad file descriptor
21:17:35.001 2 EXTFILTER(DKIM_sign) task terminated. retCode=-9
21:17:38.000 3 EXTFILTER(DKIM_sign) failed(will retry): FILE
Queue/70026.msg. Error Code=bad file descriptor 21:17:41.000 3
EXTFILTER(DKIM_sign) failed(will retry): FILE Queue/70026.msg. Error
Code=bad file descriptor 21:17:41.002 2 EXTFILTER(DKIM_sign)
program(/usr/bin/perl /usr/bin/helper_DKIM_sign.pl) relaunching
21:17:41.002 2 EXTFILTER(DKIM_sign) program(/usr/bin/perl
/usr/bin/helper_DKIM_sign.pl) launching 21:17:41.003 2
EXTFILTER(DKIM_sign) program(/usr/bin/perl /usr/bin/helper_DKIM_sign.pl)
launched


When I test the helper manually, it works as expected:
[root@ip-172-16-22-58 ~]# /usr/bin/perl /usr/bin/helper_DKIM_sign.pl
* helper_DKIM_sign.pl started.
1 FILE /var/CommuniGate/Queue/70029.msg
1 ADDHEADER "DKIM-Signature: v=1; a=rsa-sha256; c=relaxed;
d=email-from.nyc;
h=from\e\t:subject:to:message-id:date:mime-version:content-type\e\t:content-transfer-encoding;
s=mail; bh=aiYy3iuz5Oji+0xI6ju56512Z\e\tFazw2sDXpIL4IOtkOY=;
b=n435ZdNhcxcYglJlj0BS14ldBFu5LgsJ2DU+uV6pV\e\thz0F5591sF7Hfk3nPyfZh6hElKNpQMm+sqvPUesji+/azgYm47RR0PvzjH1y9gV6\e\trBsQ6DLVcqrmlNilThIw1WtNgs6sSjm3F3fPyqTCYiTYkXq/uHN2XCHc1QOBuXe8\e\tn4="

What could be the problem?
Any pointers will be appreciated.

-- 

Artëm Kazantsev <mailto:[email protected]>