[MlMt] Blacklist question

[Randall Meadows]

I keep getting spam to my Gmail address, addressed to 
"Randall at aol.com"—both To: and Cc:, which is not my Gmail address…

I notice if I right-click on that address that I can "add to blacklist". 
  What exactly does that do?  I've not been able to find much 
information online about "blacklist" in MailMate.  Do I gather correctly 
from the list archives that this is just a way to prevent an address 
from participating in address auto-completion?  Or is there more to it?  
Note that the incorrect/spammy address is a recipient address (albeit an 
incorrect one) not a sender address--does this matter?

I also keep marking those messages as spam with my SpamSieve, but it's 
not "taking"...


randy