Recommended mail anti-spam solution: ASSP
March 2, 2009 at 9:43 AM
If you’re running you’re own mail server and looking for an anti-spam solution be sure to take a closer look at ASSP (which stands for AntiSpam SMTP Proxy). I’m using it with my own mail servers and what can I say – I’m more than happy with it.
- It’s free, so no risk to try it whatsoever
- It uses a plethora of different spam recognition and fighting techniques, such as:
- Greylisting (which alone already keeps off 80% and more of unwanted mass mail)
- Bayesian filter
- Sender/HELO validation
- DNS/address blacklisting
- Sender Policy Framework (SPF) / Sender Rewriting Scheme (SRS)
- It’s low on CPU use
- Choice between test mode (e.g. tag subject of possible spam with something like [SPAM]) or “real” mode (block spam altogether)
- Lots of options and statistics, all accessible through a browser interface
There are some minor cons, though
- Installation not trivial
- Memory use is not spectacularly low (about 50MB on a machine receiving 1000-2000 mails per day)
I don’t find those issues to be real problems. Once it is installed it runs fine and my servers are able to handle the additional memory use.
Here’s what you need:
For me ASSP has cut down the amount of spam tremendously! I’m running in test mode for two month now. Currently I receive between 0 and 7 mails per day tagged as [SPAM], the rest is blocked by greylisting already.
Some useful links regarding ASSP: