Allways problems with SMTP and ISPConfig, am i doing something wrong, or what?
First of all, its a problem with clamav and not ispconfig. ISPConfig is a controlpanel that writes config files, it does not filter your emails. The second thing is, this setup works on ten thousands of servers without an issue, so you can rest assured that its a problem with your server and not a general problem with the setup.
You can not send emails because you stopped the filtering service. To be able to send emails again, ensure that your clamav is up to date:
Then restart the filter so that they are online: