mainsleaze

1. Spam emitted by a reputable, mainstream company (as opposed to fly-by-night Viagra oeddlers and the like). Sometime this happens in honest ignorance, but the reputation danage can take years to live down.
2. Occasionally used for a big-time spammer, with its own {fat pipe}, their own mailservers, and a {pink contract}. Almost impossible to get shut down.

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