Email delivery protocols / methods.

Bill Gunshannon bill.gunshannon at
Tue Jul 9 19:43:13 CDT 2019

On 7/9/19 9:14 AM, Paul Koning via cctalk wrote:
>> On Jul 8, 2019, at 11:27 PM, Grant Taylor via cctalk <cctalk at> wrote:
>> ...
>> On 7/6/19 12:57 PM, Paul Koning via cctalk wrote:
>>> There's the MAIL-11 protocol (end to end, no MTAs) and the DECmail protocol which may be some OSI-like thing, I'm not sure anymore.
>> I guess I don't know enough about MAIL-11 to understand why you say end-to-end / no MTA.
> No mail servers.  You address mail to node::user and it contacts the mail protocol listener at that node, which drops the message into the mailbox of that user on that system.

The "protocol listener" as you call it is the mail server.

UUCP and SMTP worked the same way until the dawn of networked MUA's
that let the mail remain on some system other than the user systems.


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