spam

I see an ever increasing number of users signing up on my site to just send duplicate SPAM messages to other users. I've added some server side code to detect duplicate messages with the following mysql query: SELECT count(content) as msgs_sent FROM messages WHERE sender_id = '.$sender_id.' GROUP BY content having count(content) > 10 The query works well but now they're getting around this by changing a few charctersr in their messages. Is there a way to detect this with MySQL or do I need to look at each grouping returned from MySQL and then use PHP to determine the percentage of similarity?

There are datasets with usual mail spam in the Internet, but I need datasets with fake reviews to conduct some research and I can't find any of them. Can anybody give me advices on where fake reviews datasets can be obtained? Myle Ott Our dataset is available on my Cornell homepage: http://www.cs.cornell.edu/~myleott/ A recent ACL paper, where the authors compiled such a data set: Finding Deceptive Opinion Spam by Any Stretch of the Imagination Myle Ott, Yejin Choi, Claire Cardie, Jeffrey T. Hancock You might be able to find something in the references. Alternatively, you can mail the authors

We have been seeing a number of spam product reviews in our Magento store. I recently installed the Fontis reCaptcha extension to add a reCaptcha form to the reviews form. In all my testing, this works great. A "real" user can't submit the form without filling out the reCaptcha portion. However, this hasn't fixed the problem. We are still getting spam reviews. Interestingly, these spam reviews also don't have a star rating. Somehow, these spam bots are able to submit a review without all the required information and completely circumventing the reCaptcha code. Any thoughts on how I can fix

We do a lot of mailing and we use Sendgrid to give it unique arguments and categories. But for storage, archiving, filtering and search capabilities, I would like to give them some other custom headers too, something like a json format of this array array('user' => 300, 'item' => 8842, 'country' => 'Croatia'); Now, is it possible for such custom headers to hurt the passthrough rate of our emails? In other words, is there a chance of our emails triggering spam filters due to having such custom headers? Swift The convention for user defined headers is to prefix them with an X- . For example X-my

I recently moved my transactional email sending to Mailgun It works good so far however I am wondering about the return-path header. Consider this email (I removed irrelevant header and replaced email/domain for privacy purposes) Delivered-To: RECIEVER@gmail.com Received: by 10.76.154.104 with SMTP id vn8csp478308oab; Wed, 4 Sep 2013 05:04:44 -0700 (PDT) X-Received: by 10.50.22.105 with SMTP id c9mr1537992igf.36.1378296283817; Wed, 04 Sep 2013 05:04:43 -0700 (PDT) Return-Path: <bounce+a801a1.c2b37-RECIEVER=gmail.com@my-website.com> Received: from so254-63.mailgun.net (so254-63.mailgun.net.