Dave Crocker writes: > On 7/20/2025 7:43 AM, Tero Kivinen wrote: > > If you count in emails inside big companies, it seems that every > > single email is CC'ed to dozen of people who might need that > > information, and every single email will keep all the context that > > thread ever had, > > Again, this confuses number of recipients of copies of the message, with > number of recipients specified in a single SMTP session.
No it does not. The number of recipient in a single SMTP session is related to the number of recipients in the email message, and only those recipients which are in same destination SMTP server are something that can be used to specify multiple recipients in the SMTP session. In lots of cases the recipients in the email are in different smtp destinations, thus there is no way of sending them using single SMTP session. In case of enterprise email cases lots of recipients do share the same smtp destination(s). They might be ending up in few different smtp session, because different divisions might have different smtp servers (i.e., different smtp destinations), but there is possibility to group the emails going to the same smtp destination to one smtp session. > The discussion has been about the latter. And indeed, by my reading, > the overwhelming indication from discussions on the wg mailing list -- > the place that wg decisions get made -- was that almost all traffic has > a single recipient in the SMTP session. Looking at the iki.fi (email forwarding service), about 2% of the smtp sessions coming in have nrcpt >= 2, meaning there were at least two or more iki.fi-member who was copied the same email, and the original sender did not split the email immediately separate smtp sessions. That still makes most traffic having single recipient, but I do not think 2% is unsignificant anyways, and as I said inside corporate or enterprise environment I would assume it is even more common to have multiple recipients in same smtp destination. -- [email protected] _______________________________________________ Ietf-dkim mailing list -- [email protected] To unsubscribe send an email to [email protected]
