From (simple) multiple accounts detection to isp/connection fingerprinting with score-based moderating/rejecting logic. These are very effective low-hanging fruit at reducing spam.

Supports migration configuration from the following XF1 add-ons;
TPU Spam Detect
Alter ego Detector
See the FAQ Known Issues for known limitations. This is not a turn-key solution, and each site may require customization!

For multiple account detection, supports reporting to reports/threads. And will send reports to the same report/thread. To send to thread you must select the "Multi-account to thread" extra.

For connection fingerprinting more additional information is collected and recorded on the account.

Note; Configuration defaults are conservative, aimed at blocking VPNs and proxies. There are a large number of configuration options for this add-on!

Link content spam checking

Instead of adding the spam phrases http:///https:// which generate lots of false positives; this allows controlling how links are treated by the content spam checker;
Explicitly allow URLs with a given domain
Explicitly moderate URLs with a given domain
Explicitly reject URLs with a given domain
Default allow/moderate/reject for unclassified URLs

Multiple account handling permissions
Bypass multiple account checking
Can enable / disable alerting for user
Can enable / disable alerting for log
View reportings.
Use Multiple account to thread add-on to send multiple account reports to threads.