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You will need giftopnm
and gocr
installed.
Installation
Save the two files below in your local configuration directory, adjusting the score in Ocr.cf
as you like, and the wordlist (my @words =
) in Ocr.pm
according to the spam you are receiving. You might want to run gocr
by hand on the image attachments to look for words that are correctly recognized.
Remarks
- Note that this is my first SA plugin, so any feedback is welcome
- The words checked for are specific for some spam I received a lot of recently.
gocr
can take up quite a bit of resources, so be careful. But it is only executed for messages that contain gif attachments.
ToDo
- TODO: Words are hardcoded. Should be a configuration parameter instead.
- Instead of checking for specific words, it might be better to "check if the image contains a certain amount of text", since it is not very likely that people send legitimate mail with text in images.
– Author: Maarten de Boer, mdeboer at iua dot upf dot edu
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