[Operators] Spam Problem And Its Simple Solution

Evgeny Khramtsov xramtsov at gmail.com
Sat Nov 19 13:40:53 UTC 2016

Sat, 19 Nov 2016 13:53:53 +0100
Marvin Gülker <m-guelker at phoenixmail.de> wrote:

> I like the general idea, but the protocol (not the questions
> themselves obviously) should be standardised into a XEP so that not
> every client creates its own idea of how to do it. You should suggest
> it on the xmpp-standards mailinglist.

I think there is nothing to be standardised, because he is describing
text-based CAPTCHAs generated on client side which is covered by

I'm not sure about 2000's (which the topic starter is referring to), but
I personally didn't see such stuff in modern popular IM clients (Viber,
Whatsapp, etc). For sure, Viber has some SPIM reporting mechanism
suggesting SPIM recognition software is running on Viber servers. Even
Google renders CAPTCHA only for suspicious clients. Since XMPP client
doesn't have a mechanism to suspect someone, it will render CAPTCHA for
genuinely legitimate contacts which is annoying.

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