Try this:
cd /opt/iredapd/tools/
python --add --blacklist 'senders@*'
Replace 'senders@' by the real username part of spammers you want to blacklist.
Try this:
cd /opt/iredapd/tools/
python --add --blacklist 'senders@*'
Replace 'senders@' by the real username part of spammers you want to blacklist.