John Levine in CircleID: The Mainsleaze Blog
“Mainsleaze is nerdy slang for spam sent by large, well-known, otherwise reputable organizations. Although the volume of mainsleaze is dwarfed by the volume of spam for fake drugs, account phishes, and Nigerian 419 fraud, it causes work for mail managers far out of proportion to its volume.
The new MainSleaze blog…is all mainsleaze all the time, and she’s having no trouble finding plenty of examples.”


