Comments for Spam filtering with qpsmtpd

Comment from Schmo on 2004-02-18

2004-02-18T21:31:04Z

Thanks for switching your theme back. :) My head was starting to hurt.

Comment from Schmo on 2004-02-18

2004-02-18T22:27:57Z

Doh! I just switch to the new Mozilla FireBird, err... Firefox, whatever they are calling it now. That caused my theme to go back to the default.

Thanks... Excellent Site!!!

Comment from Adam Kalsey on 2004-02-18

2004-02-19T03:08:09Z

Check for a resolvable “from” host. Very effective for anonymous spamming, as it requires that the from host resolve. Yes, if Verisign reimplements Sitefinder, they will break this step.

Not if qsmtpd is looking for MX records instead of A records. Siteminder works with A records and doesn't care about email, so it wasn't doing MX. Since any host sending mail should have an MX record, resolving the MX should work fine.

Comment from Ask Bjørn Hansen on 2004-02-19

2004-02-20T05:43:40Z

Adam, it's looking for both MX and A records. Of course being a tiny bit of Perl code it's trivially easy to change it to ignore the Sitefinder IP if they enable it again.

- ask

Comment from Mark Jaquith on 2004-02-25

2004-02-26T05:24:39Z

What is your rate of "overfiltering?" As I added additional layers to my mail (Brightmail, SpamAssassin, SpamPal, Regular Expression filtering, Bayesian filtering), I found that it was filtering out a good deal of wanted mail. I'm hoping that over time I can rely more on a combo of Bayesian/Regex and a whitelist, as those automated spam lists, such as SPEWS, sometimes get overzealous.

Comment from Achim Rosenhagen on 2004-05-04

2004-05-04T13:17:00Z

Hi Brad,

I bookmarked this article and now that I've set up my new mailserver I also implemented qpsmtpd and it really rocks! I have no account at Knowspam - so I searched for other solutions and stumbled accross TMDA (Tagged Message Delivery Agent). It's quite impressive how it can handle the challenge/response thing and it also offers "tagged" addresses. And the best: It is Open-Source and was initially developed to run under qmail.

So maybe I'll implement this if my Spam-rate is bad with the wonderful greylisting ;-) Check this out - maybe it's also a solution for you (while Knowspam reduces the money in your pocket).

have fun

http://feralboy.com/log/links/archives/2004_02_18.html#000875

2004-02-18T23:36:57Z

Brad Choate: Spam filtering with qpsmtpd...

Advanced Spam Filtering

2004-02-19T03:06:39Z

Brad Choate has a fairly complicated spam filtering setup that's based on qpsmtpd. After reading his story, I'm very tempted to give qmail another shot....