I wish to set up a form that upload a lead into Salesforce using Joomla 2.5. I would like to add an input field that allows people to attach their CV. How does your software cope if somebody loads a form with a virus, does this infect the Joomla site, or does the file go striaght to the admins email address and hence the virus protection on the admins email address will detect the virus if there is one?

RSForm!Pro does allow you set update file related restrictions such as size and most importantly based on the its extension.

Further to this, you can also consider using a security specialized extension that may provide additional protections as well. RSFirewall! is one of them. You can read more on it here:

http://www.rsjoomla.com/joomla-extensions/joomla-security.html