1) How do I distinguish the messages from these robots from spam?
A lot of them advertise these horrible services.
Use a VERP. Another robot should reply to the VERP, whereas a human
should reply to the Reply-To.
lots of robots use reply-to. isn't that the default behavior of
anything based around procmail that uses formail to build there return
address?
Clueless bots are always going to be a problem (see vacation
messages). You have to use cluefull bots and complain to the ISP of
those who use dumb bots.
If you depend on clueful bots and people fixing them, then it's a
non-starter. Ain't gonna happpen.
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