![](https://secure.gravatar.com/avatar/334b870d5b26878a79b2dc4cfcc500bc.jpg?s=120&d=mm&r=g)
28 Oct
2011
28 Oct
'11
5:42 p.m.
Barry Warsaw writes:
I think it makes sense to have a header identifying the MLM that the message flowed through, and List-Agent seems like a good choice.
Are lists the only agents that forward-with-changes? (Obviously MTAs forward, and they do in fact make changes to the headers, but those changes are restricted to those mandated by RFCs. And they don't touch bodies, ever, AFAIK, with the exception of From-stuffing.)
What about the case of iterated lists (eg, internal aggregators used by an organization)?