Virus protection does not work: users are not getting notifications about emails with viruses, but emails are blocked and not delivered.
maillogon the Postfix node and found that Drweb is not checking messages because daemon is not running:
postfix.ppa.tld qmail-queue: dwlib: fd: connect() failed - Connection refused postfix.ppa.tld qmail-queue: dwlib: tcp: connecting to 127.0.0.1:3000 - failed postfix.ppa.tld qmail-queue: dwlib: cannot create connection with a DrWeb daemon postfix.ppa.tld /usr/lib64/plesk-9.0/psa-pc-remote: handlers_stderr: SKIP postfix.ppa.tld /usr/lib64/plesk-9.0/psa-pc-remote: SKIP during call 'drweb' handler
DrWeb license key is not isntalled for the Postfix service node.
Install DrWeb license key and assign it to the proper service node in Administration Panel > System > License Manager > Additional Licenses tab > Install / Update.
You can find more in our documentation: Installing License Keys for Service Nodes.