We all now there are lots of ANTI SPAM/Virus appliances, software solutions etc. out there. But somehow in my production & test environment it was too expensive or too much hazzle. All the products I thought were interesting were too expensive or didn’t work like they suppose to. Because I didn’t want to spent thousands of dollars for hardware/software and licenses I started looking for a solution.
I ran into mailcleaner.org. They have a community driven antispam & antivirus solution with some a nice feature pack :
SMTP gateway
- fully compatible with any SMTP server
- routes mail on a per-domain basis
- per recipient/host whitelist and blacklist
- SMTP and LDAP/Active Directory callout for e-mail address validation
- temporary storage with retries in case of final server failure
- outgoing load balacing and/or failover
Anti SPAM
- SpamAssassin base ruleset and additional rules
- Bayesian controls, with auto-learn
- RBL checks
- Checksum protocols such as Razor/DCC/Pyzor
- URL RBLs
- SPF checks
Administration Web Gui
- Complete configuration of filtered domains, with forwarding and preferences
- configuration of the base system (network, proxy,…)
- access to all users’ configurations and quarantine
- full real-time spam quarantine access
- full real-time blocked content protection policy configuration
- advanced administration access list, so you can delegate light administrative access to other people, such as a hotline for example
- monitoring of the whole mailcleaner filter farm
- access to all logs
- mail queue access and control
User Web Gui
- Authenticator connectors so your users won’t have to remember another credential
- Full access to their quarantine, with message release and analysis options
- per e-mail address configuration options, such as delivery mode (tag, quarantine, drop) and periodic summaries
Installer
- support for almost any x86 compatible hardware
- automatic software raid genertion
and much more…
For your impression watch the screendumps :
Some details I left behind because of security purposes. But it took me about 10 minutes to install it, another 10 to configure it and I totally forgot I was running it for some time untill now. 
Just check it out at : http://www.mailcleaner.org