The trick is to make it so the mail isn't replicated as it's infinite bounced, so we don't get infinite copies (don't clog the tubes!). It's something I've been

The trick is to make it so the mail isn't replicated as it's infinite bounced, so we don't get infinite copies (don't clog the tubes!). It's something I've been struggling with in a piece of software I've been writing, actually. My solution is to simply not allow for loops: There is only one canonical path between any two server (netsplits, yay!)