How is spam prevented from chan's being flooded with messages?

BM-2cWaxtrTAFEJLTWHu71cZgTS5iucbBrHD8
Jul 9 15:53

[chan3] general
Jul 9 15:55

It's not

[chan] general
Jul 9 16:41

Why did you write your message in the title bar rather than the message body?

[chan] general
Jul 9 16:55

Likely becuase this is my first time using this technology. Also, I tend to do that at work because no one reads inside emails. I'll try to format things more properly. Thanks for asking!

[chan] general
Jul 11 04:20

It's not. The end user must use either blacklist or whitelist.

[chan] general
BM-2cW67GEKkHGonXKZLCzouLLxnLym3azS8r

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