Marshall Rose
<mrose+internet(_dot_)ietf(_dot_)mxcomp(_at_)dbc(_dot_)mtview(_dot_)ca(_dot_)us>
wrote:
regardless, certainly the current smtp architecture is based on a
store-and-forward model, and while many sites are configured such that
domains are reachable in one hop, other sites are legitimately
configured otherwise.
e.g. sites with temporary/flaky connectivity.
e.g. Backup MXs.
e.g. Roaming users.
Q: Who would apply LMAP when receiving mail from backup MXs?
A: People who want to do pointless work.
Q: Who would use SMTP to submit mail when SUBMIT exists?
A: People who haven't yet upgraded.
setting aside the architectural issues, it is clearly worthwhile to
discuss whether disenfranchising these sites is a possibility, and, if
so, whether it is worthwhile.
I don't see how LMAP disenfranchises sites which get messages via
store & forward. If you know your mail is being stored on another
server and forwarded to you, it's pointless to require that site to
have an LMAP record for your domain. And even if a domain does
require it, the domain aministrators can add LMAP records to their own
DNS.
Similarly, LMAP doesn't disenfranchise sites which deliver mail via
store & forward
This isn't a solved problem. It's not even a problem.
Alan DeKok.