[TZubiri]

You can't have the cake and eat it too.

Either you use cheap infrastructure that attackers can buy by the bulk for sybil attacks.

Or you pay a reasonable price for a slice of an IP block that doesn't share its reputation with elcheapos.

[doubled112]

No disagreement here. I had never planned to use it for email, but I was bored and I already had it when I got an idea.