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DNSBL plugin: does it exist? Want to build one.
 
Currently I use the SpamPal as my main anti-spam tool.

I'd like to pull all the DNSBL code from the SpamPal and make the plug-in.

Did anyone attempt such a task?

Why the Bat! does not have this functionality on itself?

I use the Selective download rule that scans the message header for the SpamPal's verdict. My goal is to kill the spam on the server. I do not feel for any form of content filtering - Bayesian for example.
What the sence of "Bayes anti-spam" if the spam message is already downloaded and the traffic is already expended?! We need to avoid the spam traffic altogether.

Is there any example project showing how to use the Bat!'s API?
winXP-SP3 Pro, the Bat! v4.0.38
 
You raise two issues:

1)
http://en.barin.com.ua/soft/mymacros/mymacros.src.zip gives you an example of a plug-in for TB, it's the source of Andrew Perevodchik's mymacros 1.07 plug-in.

2a)
The sense of Bayesian anti-spam filtering is to avoid the waste of time for spending to decide what's spam and what not. Waste of bandwidth is only a secondary issue.

2b)
I suppose you've never been blacklisted by spampal, because some idiot forgot he subscribed to your opt-in newsletter and subsequently reported it as spam. Or your dynamically assigned IP-address was previously used by a spammer or a virus. Examples like this are plenty.

Blacklists not maintained by yourself are dangerous. For private persons it's mostly bothersome to be refusing legitimate mail, for a business it's deadly.

That's the reason I'll never resort to SpamPal, YMMV of course.
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I'm just a user of The Bat! I don't work for Ritlabs.
 
I am using AGAVA AntispamServent plugin created for The Bat! and it has great power, I have 2 false positives on 5000 messages, I have trained him for two days. But it is a shereware :-(
http://www.antispamservant.com/bat_plugin.shtml
 
Thank you for 1).

2a) and 2b) are non-issues for me - I'm GPRS connected.
The waste of traffic is the show-stopper for me. I'd rather live with some non-zero percentage of false-positives. I do not see it as the tragedy to have couple of valid mails tagged.

My Selective download rule is set to Ignore the SPAM-tagged messages, I'm in the full controll to override the SpamPal's verdict any time.

Also I do not believe in the ability of content filter to handle any non-English language especially if the letter were a *.GIF attachment...

RE Talks about "good" and "bad" ISPs - as long as there are (lots of) guys who are ready to pay for the spam-traffic - any ISP will be happy of having the huge amount of spam out there. Once you refuse to pay the excess - ISPs will have to fight spam themselves - they've wasted some traffic to accept the spam into your e-mail box but you've killed the spam saving your own traffic - ISP's balance goes negative.
We must teach them, not Bayesian theoryes, teach ISPs by means of money. This is the only universally understood language.

Unfortunatelly my ISP is slow in implementing the modern anti-spam techniques, here I'm on my own. And I'm 100% sure - the program like the Bat! - the really best one - must have proper means for every situation and environment.
winXP-SP3 Pro, the Bat! v4.0.38
 
Are there any plans to add DNSBL functionality to the Bat!'s native filtering system?

(I ask to avoid doing the duplicate work.)
winXP-SP3 Pro, the Bat! v4.0.38
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