On Mon, 19 May 2008, Alexey Melnikov wrote: > > Regarding metadata transfer: it might be handy. I was thinking about an SMTP > extension for passing IMAP flags from sender to recipient, for example I can > annotate a message with flags using Thunderbird [something I can do already], > then forward the annotated message [something I can't].
The message envelope is lost at final delivery time, so MUA-to-MUA data transfer has to be done via the message header. (This is why there are different mechanisms for DSNs and MDNs. DSN information is for consumption by MTAs so it's in the envelope, and MDN information is for consumption by MUAs so it's in the header.) The IMAP server is a very borderline case between MTA and MUA so it might not be immediately clear that your idea is wrong. However you might want to forward a message as an attachment with IMAP flags, in which case there's no envelope in which to stash them. Tony. -- f.anthony.n.finch <[EMAIL PROTECTED]> http://dotat.at/ CROMARTY FORTH TYNE DOGGER: NORTHERLY BECOMING VARIABLE 3 OR 4. SLIGHT OR MODERATE. SHOWERS. GOOD.
