On 12/14/2013 7:05 PM, Sam Mulvey wrote:
Using dovecot 2.2.9 and pigeonhole 0.4.2
The system is a Xen VM running Arch Linux x86_64, presently up to date, on an XFS filesystem in an LVM2 partition. After recently updating my mail server, I found that a sieve rule I had which would check X-Spam-Score for a value over a certain number, in my case 2.5. In my most recent update, negative values would trip the rule.
Here's the rule in question:
# rule:[Spam Filter Subject] if anyof (header :contains "Subject" "[SPAM]", header :value "gt" :comparator "i;as cii-numeric" "X-Spam-Score" "2.5") { fileinto "Spam Box"; stop; }
http://tools.ietf.org/html/rfc5231#section-3 :
Note: the "i;ascii-numeric" comparator does not support negative numbers.
I have a successful work-around by checking the numerical value and also insuring that the header doesn't contain a '-', and things work as they should. Possible the bug could be in my Sieve interface, which is a RoundCube plugin. Otherwise things are working great.
If there's anything I can add, please let me know. Thanks!
Checking for a minus is a good workaround.
However, there is also a special set of nice Sieve extensions for the purpose of checking spam score: http://tools.ietf.org/html/rfc5235 . It requires some configuration at the server (http://wiki2.dovecot.org/Pigeonhole/Sieve/Extensions/SpamtestVirustest), so it may not always be available. Of course, Roundcube also needs to support it for it to be useful, but I am not sure whether it can normally use those extensions. A quick peek at the sources of the managesieve plugin shows that it probably doesn't support the spamtest extension:
https://github.com/roundcube/roundcubemail/blob/master/plugins/managesieve/l...
I also took a quick peek at the source code of JohnDoh's sieverules plugin for RoundCube, and it looks like that one does have support for it. Note that that is a different (more feature-rich) Sieve plugin than the managesieve plugin included in the RoundCube distribution itself.
Regards,
Stephan.