Flag a comment as spam based on the number of links it has.
Blacklist commenters in reaction to previous spam.
Disable trackbacks and pingbacks.
Only allow registered users to post comments in Discussion settings.
Install akismet plugin
Set Akismet to ‘delete the most pervasive spam’. It will save the ones it questions for your decision but if it knows the spam already then it will delete it.
Any channel that lets a spammer post something needs to be monitored by the admin and or an automated system like Akismet. Else you are just declaring an open house.
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