This one bit me on Tuesday night....

Osirusoft, one of the largest anti-spam blacklists, has been shut down by its operator following a barrage of massive Distributed Denial of Service (DoS) attacks that have crippled the service.
from ZDNet UK.
I was sending three e-mails on Tuesday night -- one to Libby, one to Tom Duff, and one to Rob McDonagh. All three bounced as being rejected, by my own mail server, due to being on the Osirusoft blacklist. This seemed really strange to me, I guess IBM does some kind of RBL checking on outbound messages as well. Resending didn't help, they all came back again. I was chatting with Chris Miller on AIM at the time, and of course, neither of us could explain it (could have been the food coma that Mr. IDoNotes was in, due to some apparently fantastic tapas in NYC...). Now we know....
It feels to me like the RBL scenario adds a signle point of failure vulnerability to mail routing. One server was unreachable, and instead of holding my mail for future delivery, the server somehow assumed that everything was on the blacklist. Can someone tell me if this is the way RBL works, or is it just something about the particular implementation?

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