Visit Our UNIX and Linux User Community

Procmail recipe: blocking 'unsubscribe and opt-out' messages....

Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers Answers to Frequently Asked Questions Email Antispam Techniques and Email Filtering Procmail recipe: blocking 'unsubscribe and opt-out' messages....
# 1  
Old 02-17-2003
Procmail recipe: blocking 'unsubscribe and opt-out' messages....

Here is a crude procmail recipe that I quickly created (NOT a procmail recipe expert, btw) that has been catching lots of spam (current second after the charset_spam recipe posted earlier):

* .*[further|additional].[email|mailings].*


* [Uu]nsubscribe|[Oo][Pp][Tt]-[Oo][Uu][Tt]|[Rr]emoved
* [Cc]lick [Hh]ere

OBTW, I think I read somewhere that procmail is not case sensitive within regular expressions and I've tested this and it seems they are not. So, the above can be simplified to:

* Unsubscribe|Opt-Out|Removed
* Click Here

Previous Thread | Next Thread
Test Your Knowledge in Computers #925
Difficulty: Medium
The earliest versions of Unix time had a 32-bit integer incrementing at a rate of 60 Hz.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

What are the differences between 'bash' and 'sh'

Hopefully this doesn't come off as too much of a "newbie" question or a flamebait. But I have recently begun working with a Sun Solaris box after having spent the past five years working with RedHat. From what i can tell, thing look fairly similar and the 'man' command is some help. But I've... (7 Replies)
Discussion started by: deckard
7 Replies

2. UNIX for Advanced & Expert Users

How to remove a file with a leading dash '-' in it's name?

Somehow someone created a file named '-ov' in the root directory. Given the name, the how was probably the result of some cpio command they bozo'ed. I've tried a number of different ways to get rid of it using * and ? wildcards, '\' escape patterns etc.. They all fail with " illegal option --... (3 Replies)
Discussion started by: GSalisbury
3 Replies

3. IP Networking


Hey all, I've bought a few bits from Belkin who seem quite happy to support FreeBSD! Last time I bought a UPS from them and it's still going well :D I saw this on their website that the 16bit PCMCIA card was supported under FreeBSD: I went to my... (0 Replies)
Discussion started by: WIntellect
0 Replies

4. UNIX for Dummies Questions & Answers

quoting echo 'it's friday'

echo 'it's friday' why appear the > (3 Replies)
Discussion started by: yls177
3 Replies

5. Filesystems, Disks and Memory

HELP! The '/var/adm/message' file increase every few seconds???

Hi, guys, I have a big problem. I've got a sun solaris 4.1.4 workstation, and the /var/adm/message file will add one row every few seconds. It soon becomes a large file. I wander if there are some mistakes configuring the workstation. the /var/adm/message is as follow: ... (1 Reply)
Discussion started by: cloudsmell
1 Replies

6. UNIX for Dummies Questions & Answers

'more' error messages

I am receiving the error message when I more to a linked file. filename: Too many levels of symbolic links It is a linked file to one directory up. The other error message I get is when I more to a linked, hidden file. filename: No such file or directory Can the more command not see... (2 Replies)
Discussion started by: mma_buc_98
2 Replies

7. UNIX for Advanced & Expert Users

Terminal 'Local Echo' lost on Modem Dial-out

Can anybody help me? I am developing a utility for automating message paging to a BT alphanumeric pager. I am using a USR 56K Fax-modem connected to /dev/cuab on a Sun Ultra-10. I am using the UNIX 'tip' utility to connect to the modem and I have configured the modem as follows: Baud Rate:... (2 Replies)
Discussion started by: mybeat
2 Replies

8. Shell Programming and Scripting

Clearify what it means under 'WHAT' when hit the 'w'-command

I wonder how I shall read the result below, especially 'what' shown below. The result was shown when I entered 'w'. E.g what is TOP? What is gosh ( what does selmgr mean?)? login@ idle JCPU PCPU what 6:15am 7:04 39 39 TOP 6:34am 6:45 45 45 TOP 6:41am ... (1 Reply)
Discussion started by: Aelgen
1 Replies

9. Programming

i can't use 'make' in my computer?

I need to compile a file,but 'make' does not work.please tell me how to use it or need which tools? (3 Replies)
Discussion started by: dsun5
3 Replies

10. UNIX for Dummies Questions & Answers

How to subtract 2 hours from 'date' in shell ( /bin/sh ) script ?

I write a sh script that zip and copy to tape all files that older then 2 hours. 1. The way I choose is - touch a file with "now - 2 hours", then use fine with '! -newer' 2. Do you have any other idea to do it ? tnx. (1 Reply)
Discussion started by: yairon
1 Replies
PROCMAILSC(5)							File Formats Manual						     PROCMAILSC(5)

procmailsc - procmail weighted scoring technique SYNOPSIS
[*] w^x condition DESCRIPTION
In addition to the traditional true or false conditions you can specify on a recipe, you can use a weighted scoring technique to decide if a certain recipe matches or not. When weighted scoring is used in a recipe, then the final score for that recipe must be positive for it to match. A certain condition can contribute to the score if you allocate it a `weight' (w) and an `exponent' (x). You do this by preceding the con- dition (on the same line) with: w^x Whereas both w and x are real numbers between -2147483647.0 and 2147483647.0 inclusive. Weighted regular expression conditions The first time the regular expression is found, it will add w to the score. The second time it is found, w*x will be added. The third time it is found, w*x*x will be added. The fourth time w*x*x*x will be added. And so forth. This can be described by the following concise formula: n n k-1 x - 1 w * Sum x = w * ------- k=1 x - 1 It represents the total added score for this condition if n matches are found. Note that the following case distinctions can be made: x=0 Only the first match will contribute w to the score. Any subsequent matches are ignored. x=1 Every match will contribute the same w to the score. The score grows linearly with the number of matches found. 0<x<1 Every match will contribute less to the score than the previous one. The score will asymptotically approach a certain value (see the NOTES section below). 1<x Every match will contribute more to the score than the previous one. The score will grow exponentially. x<0 Can be utilised to favour odd or even number of matches. If the regular expression is negated (i.e., matches if it isn't found), then n obviously can either be zero or one. Weighted program conditions If the program returns an exitcode of EXIT_SUCCESS (=0), then the total added score will be w. If it returns any other exitcode (indicat- ing failure), the total added score will be x. If the exitcode of the program is negated, then, the exitcode will be considered as if it were a virtual number of matches. Calculation of the added score then proceeds as if it had been a normal regular expression with n=`exitcode' matches. Weighted length conditions If the length of the actual mail is M then: * w^x > L will generate an additional score of: x / M w * | --- | L / And: * w^x < L will generate an additional score of: x / L w * | --- | M / In both cases, if L=M, this will add w to the score. In the former case however, larger mails will be favoured, in the latter case, smaller mails will be favoured. Although x can be varied to fine-tune the steepness of the function, typical usage sets x=1. MISCELLANEOUS
You can query the final score of all the conditions on a recipe from the environment variable $=. This variable is set every time just after procmail has parsed all conditions on a recipe (even if the recipe is not being executed). EXAMPLES
The following recipe will ditch all mails having more than 150 lines in the body. The first condition contains an empty regular expression which, because it always matches, is used to give our score a negative offset. The second condition then matches every line in the mail, and consumes up the previous negative offset we gave (one point per line). In the end, the score will only be positive if the mail con- tained more than 150 lines. :0 Bh * -150^0 * 1^1 ^.*$ /dev/null Suppose you have a priority folder which you always read first. The next recipe picks out the priority mail and files them in this special folder. The first condition is a regular one, i.e., it doesn't contribute to the score, but simply has to be satisfied. The other condi- tions describe things like: john and claire usually have something important to say, meetings are usually important, replies are favoured a bit, mails about Elvis (this is merely an example :-) are favoured (the more he is mentioned, the more the mail is favoured, but the maxi- mum extra score due to Elvis will be 4000, no matter how often he is mentioned), lots of quoted lines are disliked, smileys are appreciated (the score for those will reach a maximum of 3500), those three people usually don't send interesting mails, the mails should preferably be small (e.g., 2000 bytes long mails will score -100, 4000 bytes long mails do -800). As you see, if some of the uninteresting people send mail, then the mail still has a chance of landing in the priority folder, e.g., if it is about a meeting, or if it contains at least two smileys. :0 HB * !^Precedence:.*(junk|bulk) * 2000^0 ^From:.*(john@home|claire@work) * 2000^0 ^Subject:.*meeting * 300^0 ^Subject:.*Re: * 1000^.75 elvis|presley * -100^1 ^> * 350^.9 :-) * -500^0 ^From:.*(boss|jane|henry)@work * -100^3 > 2000 priority_folder If you are subscribed to a mailinglist, and just would like to read the quality mails, then the following recipes could do the trick. First we make sure that the mail is coming from the mailinglist. Then we check if it is from certain persons of whom we value the opinion, or about a subject we absolutely want to know everything about. If it is, file it. Otherwise, check if the ratio of quoted lines to orig- inal lines is at most 1:2. If it exceeds that, ditch the mail. Everything that survived the previous test, is filed. :0 ^From mailinglist-request@some.where { :0: * ^(From:.*(paula|bill)|Subject:.*skiing) mailinglist :0 Bh * 20^1 ^> * -10^1 ^[^>] /dev/null :0: mailinglist } For further examples you should look in the procmailex(5) man page. CAVEATS
Because this speeds up the search by an order of magnitude, the procmail internal egrep will always search for the leftmost shortest match, unless it is determining what to assign to MATCH, in which case it searches the leftmost longest match. E.g. for the leftmost shortest match, by itself, the regular expression: .* will always match a zero length string at the same spot. .+ will always match one character (except newlines of course). SEE ALSO
procmail(1), procmailrc(5), procmailex(5), sh(1), csh(1), egrep(1), grep(1), BUGS
If, in a length condition, you specify an x that causes an overflow, procmail is at the mercy of the pow(3) function in your mathematical library. Floating point numbers in `engineering' format (e.g., 12e5) are not accepted. MISCELLANEOUS
As soon as `plus infinity' (2147483647) is reached, any subsequent weighted conditions will simply be skipped. As soon as `minus infinity' (-2147483647) is reached, the condition will be considered as `no match' and the recipe will terminate early. NOTES
If in a regular expression weighted formula 0<x<1, the total added score for this condition will asymptotically approach: w ------- 1 - x In order to reach half the maximum value you need - ln 2 n = -------- ln x matches. AUTHORS
Stephen R. van den Berg <> Philip A. Guenther <> BuGless 2001/08/04 PROCMAILSC(5)

Featured Tech Videos