On Thu, Apr 26, 2018 at 07:53:54AM -0400, rhkra...@gmail.com wrote: > On Thursday, April 26, 2018 01:29:17 AM to...@tuxteam.de wrote: > > On Wed, Apr 25, 2018 at 10:05:41PM -0500, David Wright wrote: > > > > Yes, the message came from tomas, but the email you received came from > > > the list server. There will be a header at the top of your email > > > > > that's being hidden from you: > > Right. There's a "From" field at the very top, without a colon. In David's > > message I'm responding to right now, I see: > > > > From bounce-debian-user=tomas=tuxteam...@lists.debian.org Thu Apr 26 > > 05:06:37 2018 > > > > right at the top of the headers. This is added by your receiving > > MTA and is thus *the* one piece of information which is most > > reliable -- it's yout MTA's account of where (it thinks) the mail > > has come from. There are (in my case) a couple of other headers > > (at the top, too) added by my MTA. > > > I'm not trying to argue, but instead trying to check what I thought was my > knowledge: > > AFAIK, that From header is what I call the mbox header--it is added in . for > the mbox style of mail storage (many emails in one folder) and is used to > separate emails). > > Two things: > ' > * in the other type of email storage (maildir--one email per file), I > suspect that header is not added > > * I suspect that not all email clients put the same thing (the perceived > sender address) in that second field (between "From " and the date). > > If anyone can speak to those points, I'd be interested. > >
For what its worth RFC 2822 specifies: "The only required header fields are the origination date field and the originator address field(s). All other header fields are syntactically optional. More information is contained in the table following this definition." You also want to distinguish between "envelope" headers and mail headers. Most MTA will put envelope information into header fields before they hand off to lmtp (local storage in most cases). -H -- Henning Follmann | hfollm...@itcfollmann.com
