Yup
Warning and delete the annoying posts. Just let them know you deleted the pointless posts and that if they continue to spam that they will be banned. Number of warnings should be lessened or greatened depending on the severity of the spam... for instance... if they posted the same thing 20 times in the same topic... That should result it in permanent IP ban.
Now if they just spammed something twice... coulda been lag. Just a warning for that is enough, no biggie.
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