In one sense, I could kind of understand it. If they can eliminate 99% of all spam by only accepting mail from a handful of domains, and if those few domains ha

In one sense, I could kind of understand it. If they can eliminate 99% of all spam by only accepting mail from a handful of domains, and if those few domains happen to be what 99% of their users get (wanted) email from, it's hard to justify the expense and hassle of accepting mail from anyone else. That said, considering how much spam is sent from gmail and other large mail providers it seems like the actual numbers probably aren't as supportive. I don't agree with it, but I could understand it. Because of the spam/blackist problem, every ISP I've worked for has ultimately either stopped providing email service or outsourced it.