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Antispam

Markup: clickable email adresses - but with antispam

serendipity_event_email_bot_obfuscator
version 1.03 (GPL, Last Updated 2016-01-06)
Stephan Manske, Ian
Serendipity >= 0.8

Makes email addresses clickabe, but obfuscates them to block spam harvester bots

Recaptcha

serendipity_event_recaptcha
version 0.20.1 (GPL, Last Updated 2017-02-05)
Christian Brabandt (based on work of Garvin Hicking, Sebastian Nohn)
Serendipity >= 1.0

Enabling a recaptcha for commenting articles (You need to apply for a key)

Spam Protector (RBL)

serendipity_event_spamblock_rbl
version 1.4 (GPL, Last Updated 2013-08-12)
Sebastian Nohn
Serendipity >= 1.2

Will reject comments made from hosts which are listed in RBLs. Pay attention that this may affect proxy-users or dial-up users.

Spam Protector (SURBL)

serendipity_event_spamblock_surbl
version 1.1 (GPL, Last Updated 2013-08-12)
Sebastian Nohn
Serendipity >= 0.8

Reject comments that contain blacklisted URLs

Spam: Challenge/Response

serendipity_event_challengeresponse
version 0.11 (GPL, Last Updated 2017-02-10)
Nobody
Serendipity >= 1.0

Spamblock (Bayes)

serendipity_event_spamblock_bayes
version 0.4.25 (GPL, Last Updated 2016-10-26)
kleinerChemiker, Malte Paskuda, based upon b8 by Tobias Leupold
Serendipity >= 0.8

Detects Spam via an algorithmus which learns.

Spamblock Bee (Honeypot, Hidden Captcha)

serendipity_event_spamblock_bee
version 1.3.0 (GPL, Last Updated 2016-06-26)
Grischa Brockhaus, Janek Bevendorff
Serendipity >= 0.8

Implements simple comment antispam mechanisms, that are easy to configure but very effective.