What anti-virus products are supported?

How can I tell if LISTSERV is actually scanning for viruses?

We already have [insert name of AV product].  Can we use it with LISTSERV instead of Windows Defender?

Do I need ANTI_VIRUS=1  in my site.cfg or go.user for anti-virus features to be enabled?

If I want to disable the anti-virus scanning feature, how do I do that?

Why do I get a notification from LISTSERV that the anti-virus database hasn’t been updated  in xx days?

Can I disable these virus database notifications?