Hi
Try following
- Matt Becket's Spam Login Filter plugin - https://elgg.org/plugins/774755
access from spammer IP addresses is blocked - Go to Code Repository for Elgg 3.x compatible version.
Very configurable in settings and effective.
- iionly's http:blacklist plugin - https://elgg.org/plugins/1641554
access from spammer IP addresses is blocked. Checks an IP database for that. Very effective
- Matt Becket's Spam Throttle - https://elgg.org/plugins/821368
Beautiful idea and it works. If someone tries to spam you with a brand-new clean IP address, this plugin will spot and hammer down that spammer.As far as I know - unfortunatey - not available for Elgg 3. Still, check the code repository just in case.
And the last but not the least, it is good to use a captcha at least for registration. There are several, but iionly's captcha is google-free if you are sensitive about privacy of your users: iionly https://elgg.org/plugins/914006
Good luck
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