Problems qmail + spamassassin + simscan (score 0/0)

Hi,

Sometimes I get spam that has been classified correctly in spamaassin as 
spam, but simscan classifies it with a score different from that 
processed by the spamd process. Sorry for my English, but I'll try to 
explain .. :)

   Here's an example:

spamd.log --> Here we see an email that was classified by the spamd 
process as suspect (score 14)

2017-03-13 18:10:48.998753500 Mon Mar 13 18:10:48 2017 [23159] info: 
spamd: processing message 
<[email protected]> for qscand:1001
2017-03-13 18:10:51.668508500 Mon Mar 13 18:10:51 2017 [23159] info: 
spamd: identified spam (14.5/5.0) for qscand:1001 in 2.7 seconds, 64622 
bytes.
2017-03-13 18:10:51.668685500 [23159] info: spamd: result: Y 14 - 
BAYES_99,DCC_CHECK,HTML_MIME_NO_HTML_TAG,JAMEF_SUBJ_BOLETO_FATURA,JAMEF_ZIP_ATTACHED,MIME_HTML_ONLY,RDNS_NONE,TROJAN_JAMEF_ZIP,TVD_SPACE_RATIO 
scantime=2.7,size=64622,user=qscand,uid=1001,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=57553,mid=<[email protected]>,bayes=0.999667,autolearn=spam

simscan.log --> However, here we see that the same email, in the simscan 
log, received 0/0

2017-03-13 18:10:51.677616500 simscan:[25948]:CLEAN 
(0.00/0.00):3.8362s::213.136.86.230:[email protected]:[email protected]

So I saved the email and executed the command simscam manually (at 
command line,  as below)  with  DEBUG option. Note that it also ranked 
the same as spam, as it should be:

# env QMAILQUEUE=/var/qmail/bin/simscan SIMSCAN_DEBUG=2 
/var/qmail/bin/qmail-inject [email protected] < savedspam.txt

<cut>
simscan: calling /usr/bin/spamc  spamc -s 1500000
simscan:[16216]:SPAM DROPPED (14.50/5.00):2.8341s:2.via 
Boleto:(null):[email protected]:[email protected]
simscan: check_spam detected spam refuse message
simscan: Putting the message in quarantine: 
/var/qmail/quarantine/msg.1489441975.579680.16217
simscan: Message recorded in quarantine successful
simscan: droping the message
simscan: exit error code: 0
<cut>

So I do not know where else to check for why simscan running 
automatically sometimes can not classify a spam, and manually, running 
the same command  manually, works fine... Strange...

I've enabled the DEBUG option in qmail-smtp.rules (SIMSCAN_DEBUG = "2"), 
but I saw nothing abnormal, no error or things like ... I'm going crazy 
here ...

Any tips? I really appreciate any hint!!

More information:

simscan version 1.4.0
compile options:
./configure --enable-user=abc  --enable-spam=y --enable-spam-hits=5 
--enable-clamav=y --enable-clamdscan=/usr/bin/clamdscan 
--enable-clamavdb-path=/var/lib/clamav 
--enable-workdir=/var/qmail/simscan/work/ 
--enable-quarantinedir=/var/qmail/simscan/quarantine/ --enable-dropmsg=y 
--enable-spamc-args="-s 1500000" --enable-ripmime=/usr/bin/ripmime 
--enable-attach=y --enable-per-domain=y