(Extremely stupid question) How can I report a spammer?

I know this question has been asked before, that’s why I categorized it as “extremely stupid”.

I know some ways to report a spammer: using this contact page or PM to the mods directly. I have tried to report some spammers to @muppetist but I’m not sure if he has received my message.

Are those methods correct? Is there any more methods? How can I report a spammer?