This really isn't a DNN question, however I do recommend the TrendMicro series of antivirus products as they cover every area and intigrate well with pretty much every use case scenario, it is true "back office" software - although it can take a while to get up to speed.

Virusscanners are unfortunately a very necessary evil... unless you are really into gambling..

Mikez,

You are completely missing the point. I always work with IT system administration and application management and I not saying I do not want to use a virusscanner. The problem is that these programs do have issues and are sometimes a resource hog and they still give you little to no protection from other vulnerabilities like the ones I mentioned in my email. My company and some of my customers have servers at big name hosting providers and when asked they never give me an explicit answer on whether or not to use a virusscanner but they always stress to lock-down the server. As a matter of fact I am often running into discussions with sysadmins when I have to tell them that the ASP.NET worker process needs to have "almost" full control on the DNN web folder. This is what worries them and they don't run virusscanners on their servers all the time (just scheduled process for scanning). I guess you don't know what are the security issues webservers.

Anyway my post was to inform the community about this problem and the SMTP test facility did not report any helpful message other than a vague message that the connection was refused by the server.

Marc