ClamAV noted back in October that they were going to end-of-life ClamAV 0.94.x on April 15th, 2010, forcing it to be disabled during updates — yesterday, for those not paying attention. Of course, Mac OS X 10.4 Tiger Server includes ClamAV 0.88.5 through 0.94, so one is required to either disable the Mail Service’s virus scanning functionality or update it manually (I’d highly suggest Topicdesk’s instructions for 10.4.7-10.4.11).
While there have been recent reminders regarding Tiger Server, Mac OS X 10.5 Leopard Server and Mac OS X 10.6 Snow Leopard should be fine, right? Actually, prior to Security Update 2009-005, Leopard Server was running Clam AV 0.94, so you’ll need to make sure it’s fully updated — I managed to find one Leopard Server mail server that had not been updated yet. Snow Leopard Server is good to go, though.
So, make sure you check your ClamAV version on both your Tiger & Leopard Server mail servers.