Perimeter Anti-Virus Solutions? (appliances open-source or not)

[MrsPotter]

Hi,

I'm looking for a perimeter anti-virus solution. I'm aware of the following packages for pfsense:

1. ClamAV
2. Dansguardian with ClamD

I already have some packages on my firewall such as snort, squid (with multi-wan) etc. So I do not want to add much more as this is a live installation and it took a while to get it running as smoothly as it does currently.

I'm thinking I could set up a dedicated AV machine. But, am not sure what will work best for this.

Does anyone know of any dedicated AV appliances (open-source or not) alternatively to PFSense? Preferably something that could do HTTPS traffic as well. And obviously email traffic.

Advice greatly appreciated.

MrsPotter