I now worked around as followed:
# apt-get install re2c
# cd /etc/cron.hourly && wget sa.schaal-it.net/sa-update && chown root.root sa-update && chmod 755 sa-update
# vi sa-update
# ./sa-update
With the following contents:
#!/bin/sh
# schaal @it
#
# Simple script to update SpamAssassin
SYSLOG_TAG=sa-update
compile=0
logger -d -t $SYSLOG_TAG "Start SA-Update"
sa-update --nogpg
retval="$?"
if [ $retval -eq 0 ]; then compile=1; fi
sa-update --nogpg --channel updates.spamassassin.org
retval="$?"
if [ $retval -eq 0 ]; then compile=1; fi
sa-update --nogpg --channel sa.zmi.at
retval="$?"
if [ $retval -eq 0 ]; then compile=1; fi
sa-update --nogpg --channel sa.schaal-it.net
retval="$?"
if [ $retval -eq 0 ]; then compile=1; fi
sa-update --nogpg --channel sought.rules.yerp.org
retval="$?"
if [ $retval -eq 0 ]; then compile=1; fi
sa-update --nogpg --channel spamassassin.heinlein-support.de
retval="$?"
if [ $retval -eq 0 ]; then compile=1; fi
if [ $compile -eq 1 ]; then
logger -d -t $SYSLOG_TAG "SA-Update found"
sa-compile
systemctl restart pmg-smtp-filter.service
else
logger -d -t $SYSLOG_TAG "No SA-Update found"
fi
Hope this works. I found 4 channels, which look fine, but I'm open for suggestions.
Next thing maybe would be to test
http://artinvoice.hu/spams/