How to tell spam from not spam

[goodnightmonkey]

Silly question,
How does one tell a spam message from a non-spam message?

Usually, by the time I log into Fiverr after receiving an e-mail that I have a message, I’m notified that I can no longer contact so-and-so and that it won’t affect my rating. One time, however, I logged in to something that could have been spam but since it wasn’t auto-blocked(?), I wasn’t certain.

So, how would one normally tell a regular buyer versus a spammer?
Thanks for the replies!

[imagination7413]

There’s actually a conversation going on about this very topic right now! Hoist the red flags
Lots of good information in here.