Everything about free forum domainHowever I was able to “save” some of the domain names that were
registered with RegisterFly. What I mean is, I was able to transfer
the domain names to GoDaddy before ICANN took away the status
from RegisterFly.
Fighting Comment Spams - There Gotta Be A Better Way
Sat, 07 Jun 2008 21:35:21 +1000
People usually associate spams with unsolicited commercial emails that try to either sell you the “little blue pill”, or Nigerians phishing for your bank account details. There are many techniques fighting email spams, either at the server side or at your email client. However if you run a blog or a forum on the Internet, you would also have experienced fighting comment spams (unless, of course, that you run a spam blog yourself :). I have been blogging since 2001 and have employed various techniques to keep the spams at bay. Some of them worked well — at the beginning — but sooner or later spammers got smartened up and they can almost slip in a few spammy comments.
When I launched this blog 2 years ago, it was running Akismet for Drupal, and recently changed to Mollom, one of Dries’ startup company/project. It has been effective (except for the last few days). Mollom is sort-of similar to Akismet that it (1) uses a classifier to determine the likeliness of incoming comment being a spam (2) acts as a centralised database to collaboratively identify spams. Mollom does a few extra things when the comment is in a “not-so-sure” state, but discussing this would be beyond the scope of this blog post.
Another interesting feature for Mollom is its Flex based statistics panel, showing the number of spams verses the number of legitimate comments. This is mine over the last 12 days:
As you can see the ratio between noise and signal is huge — there are many more spams than real comments. By the way, even for many real comments I am still not so sure about their legitimacy especially those one liner generic comments. As you can see there was a big jump today, because quite a few spams slipped through.
Although the ratio seems to be inline with most studies online, it still surprises me, when I compare it with the SNR of my email spams. I am running my main MTA at home with Postfix 2.4, and spams are filtered with DSPAM, a fast and light-weight email classification system that yields pretty good result (99.12% currently for my account). Here is the analysis graph over the same period of time (generated by dspam-web).
As you can see from the graph — there are only around 20% more email spams than legitimate emails! Not huge difference in the case of this blog’s comment vs. spams.
Now, do we actually get relatively less email spams than comment spams? Not really. But what we do have is better email-spam fighting techniques that block out most email spams before they reach the classifying system (DSPAM in this case). Therefore what DSPAM gets is already a filtered subset of all the incoming email spams. A few techniques deployed:
- Greylisting (see my previous article on this subject). I actually don’t put greylisting on my primary MX anymore due to undesirable delay. However I found by putting greylisting on my secondary MX it is just about as effective, as most spambots pick the last MX entry in DNS to send spam to.
- DNS-related filtering. For example ensuring sender has a FQDN, and a valid hostname, etc. I am surprised to see how many spams are actually filled with invalid sender addresses.
That’s about it, but many people I know also employ RBL, domain-key, etc. At least in my case they have effectively reduced the work for the classifier, which also result less spam getting into my INBOX at the end.
There gotta be a better way to fight comment spams — something between the web server and the actual application that filters out the obvious spams. Bad-Behavior? Mod_Security? They also increase undesirable false negatives though.
Any more thoughts?
Have a great weekend and talk to you next week
New Hosting From LiquidWeb and FastdomainSun, 23 Mar 2008 18:43:00 +0000
We have recently added to new companies to the main web
hosting directory here at the CaymanHost.
The first is Liquidweb based on personal recommendation from a customer. Liquidweb offer a wide range of hosting solutions from shared, through VPS and managed dedicated servers. As a quality provider with a reputation for very good customer service their prices tend towards the mid to upper range but in terms of value for money they come highly recommended.
The second of our new hosting partners are Fastdomain who offer shared hosting plans at $6.95 which includes a domain name. Placed right in the competitive heart of pricing, they do offer some big numbers in terms of storage and monthly bandwidth and provide the familiar features of a modern hosting panel - in this case cPanel with Fantastico included. For those in the market for a web hosting solution at less than $10 per month they compare favorably with many of the bigger names and are worthy of consideration. The web site contains a demo function so that potential customers can have a play around with some of the main features before making any firm decisions.
If anyone has any feedback about either company to share with our readers, we would welcome it as always.
Both companies are listed on the main directory page. Remember to subscribe to stay up to date with all our latest hosting news and coupon and discount offers on both web hosting and domain name registration.
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