On 24 Oct 2000, at 14:45, James M Galvin wrote:

<snip>

> In my opinion, VERPs belong at the envelope layer, not in the message
> (i.e., individual addressing), because I try very hard to enforce the
> postal analogy to an extreme: you don't steam open the envelope and
> mess with what's inside.  Of course that makes VERPs less than 100%
> effective, since not all email systems respect the separation.

This is a "yeah, but" situation.  Putting the information in the smtp 
envelope would be elegant, but not as robust.  In particular, people 
using multi-pop lose the envelope at delivery time, which could cause 
problems, depending on when and where the mail bounced.  If you 
put verp information in the smtp envelope and the smtp agent 
accepts it, but the multi-pop agent rejects it, you lost your verp 
information. 

Mike

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