Daemon, > When the user clicks " Not Spam" in thunderbird. -E-mail goes to your inbox. > These e- mails from the inbox would like to add them to a whitelist .
This goes *way& beyond the role of Amavis, it's pop of imap you are talking about. Olivier >> Date: Tue, 24 Feb 2015 10:55:21 +0300 >> From: [email protected] >> To: [email protected] >> Subject: The nonsense of training spam filters and spam folders [was: >> training spamsassin] >> >> >> > I would like to spend a script in each user box by adding the sender >> > on the whitelist . >> >> Please try at least to understand how a spamfilter is working. Read the >> amavis introduction section in the documentation to understand what >> amavis is, does and what is not, does not. >> Understand how Bayesian filters are working. >> Start with the wikipedia articles >> http://en.wikipedia.org/wiki/Naive_Bayes_spam_filtering and >> http://en.wikipedia.org/wiki/Bayes%27_theorem >> >> When you have understood how this filter is working you don't want to >> train it any more because the you have understood that you push the >> detection in a direction where you usual don't want it. >> >> The kind of "white" listing you might want is amavis' pen pal feature. >> The documentation for amavis is poor: Is known. Read the change logs and >> have a look at the source code. This is the real documentation. >> For finding out how a feature has to be configured you don't have to be >> Perl Guru. Some basic Perl knowledge is usual fine. >> >> White listing? Why? >> If a mail is tagged as spam then in 99.999% of all cases it is spam. And >> in 99.999% of all cases of "false" positives the sender has done >> something really wrong or his mail client/mail server is fucked up. >> Why should I white list them? >> If they are not able to send a at least somehow correct mail they don't >> want to communicate. >> It is like on a road section a few idiots are driving on the wrong side. >> Are the other drivers accepting this? Will they also start driving on >> the wrong side on this section? Sure not. >> And in case there is a serious real reason why I must white list a >> sender (at the moment no idea what this should be, never needed it): >> Don't mess around with the filter. >> Exclude them before the spam filter or write a spamassassin rule and >> deduct some points if this rule is matching. >> Samples and a how to write rules you find in the online spamassassin >> documentation https://wiki.apache.org/spamassassin/WritingRules >> >> And when you have understood this and you think it all to the end then >> you don't want any white list, spam folder or quarantine. >> All incoming mail you filter during delivery in real time and reject all >> spam hard with 5xx. >> All mail from authenticated users you filter (yes we filter all mails. >> In and out) post-queue (maybe all spam filters are busy at the moment >> and I know no mail client able to handle 4xx errors proper). If the >> sender restrictions are correct (sender_mismatch and so on) it is save >> to bounce them so your client getting a report why his mail was >> rejected. You might have to change the report templates to make them >> more client understandable. >> My experience is: Time on the sending computer is not set correct >> combined with several other mistakes like: This is a important mail, so >> I write EVERYTHING IN CAPITAL LETTERS or a home brew software is >> creating simply completely broken mails. Assembling a correct formatted >> mail is more difficult than it looks like. >> >> Real time filtering. You don't want to support spammers. >> If you first accept with a 250 response code and then filter: 250 means >> accepted for delivery. If it ends up in the inbox, quarantine is >> discarded: Does not matter it is delivered and the spammers gets paid. >> What to do with the accepted spam? >> I can not bounce it: Sender usual faked, backscatter and I end up on a RBL. >> I can not discard it: I don't know one country where this would be not a >> crime. >> I have to deliver it. >> So I throw it in a quarantine or spam folder where it will be lost. >> Which client is checking the spam folder frequently? None. >> From time to time (quota warning: Mailbox nearly full) the entire spam >> folder is deleted: Mails are lost. >> Ever checked on a quarantine system like maya how often users are >> checking it? I can tell you: Never. >> What is with rarely happening false positives? >> Might be a really important mail. Who will pay for the potential damage? >> Sender: "I informed you about changes in time. I have a 250 delivered. >> You got the mail." >> Receiver: "I did not get this mail." >> Court: "250 response code means: Delivered to your premises. If you >> loose it in house: Your problem." >> >> If I have to check a quarantine or spam folder frequently for what do I >> need it? >> I want this all in my inbox. Making it easier. >> If I get all this crap in my inbox: For what do I need a spam filter? It >> is absolute useless. >> And don't tag mails as spam by changing the subject: You break DKIM >> signatures. >> >> If I do pre-queue real time filtering: The rarely bounced false >> positives giving the sender within seconds the information: Not >> delivered. He can try again, pick the phone or whatever but the >> information will not be lost. >> >> Andreas >> >> >> > > > [2:text/html Show] > --
