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16 Jul 2014
The recent DMARC kerfluffle has brought new attention to mail forwarders that send mail on behalf of other people. We've been giving a lot of thought to ways to tell nice forwarders from nasty ones, so that mail systems can deliver mail from the nice ones and filter the nasty ones. It occurs to me that there are several scenarios for the way that forwarders work, so I've collected them in a little chart. We assume that forwarders can sign the mail they send, so there's no problem telling that mail from the forwarder really came from them. We also crudely divide agents into Good ones that send mail that the recipients generally want, and Bad ones that send mail that the recipients don't want. Each row of the table starts with three letters. They mean:
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