450 or 550 code

From: Gator (no email)
Date: Thu Nov 13 2003 - 23:26:56 EST


Is it better to respond to an unknown address with a 450 or a 550 code?
I'm not sure I understand the difference. Which one would tell a
spammer to not try again (as if they care that much).

 

Thanks - Jack

 








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