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How to stop spammers, and not impair the good customer experience


#1

Hello,

Recently we had to spend some time on fighting email spammers, who used “Share” function of Checkvist to send emails with hand-crafted “share note”.

The summary of what worked for us is here: http://blog.checkvist.com/post/166940442968/how-to-stop-spammers-and-not-impair-the-good

What did not work:

  • blocking spammer IPs (they have plenty resources, really)
  • adding limitations by a number of sent invitations (they created different lists, different accounts, removed and re-created invitations)
  • avoiding sending many emails to a particular domain (qq.com is the famous one).

Maybe our experience will be useful to some of the people here :slight_smile:

Best,
KIR


#2

So email verification and reCAPTCHA?

Spammers can verify the source emails, can’t they?

And reCAPTCHA… I do not really know how it works, but I recently heard a neural network was trained to work around reCAPTCHA.

So… do not relax as of yet.


#3

I hope they have not yet worked around invisible reCAPTURE as of 2017.

When this reCAPTURE is unsure if you’re a human you should identify some objects on several pictures. I don’t think it can be solved by IA yet. It may be cheaper to hire some poor mechanical turks to pass the capture than to use IA.