Fun_People Archive
12 Sep
"uu" stands for "user unknown"...

Date: Mon, 12 Sep 94 13:42:25 PDT
To: Fun_People
Subject: "uu" stands for "user unknown"...

[Our local success story clears up a little mystery about all
those programs whose names start with "uu"... -psl]

Forwarded-by: bostic@CS.Berkeley.EDU (Keith Bostic)
Forwarded-by: Jan-Simon Pendry <>

This is an extract from the microsoft smtp/ms-mail "gateway" (sic)
operations and apology guide.


Date:    Tue, 30 Aug 1994 19:10:34 +0100
From:    David Brebner <>

PSS ID Number: Q87045
Article last modified on 06-17-1994
PSS database name: W_GTWAY
The information in this article applies to:
 - Microsoft Mail Gateway to SMTP, version 3.0
The Microsoft Mail Gateway to Simple Mail Transfer Protocol (SMTP)
polls the SMTP mailbag file on the gateway postoffice database and
converts this file to an "SMTP message." Attachments are searched for
non-7-bit characters and user unknown encoded (uuencoded) if any are
found. 7-bit ASCII attachments are included in the message body.
The gateway then opens an SMTP connection with the designated SMTP
host and sends the mail items. The host will route the message to its
final destination.
Upon receiving mail, the gateway checks to see if the recipient is valid.
If the recipient field is invalid, it fails the message, and the log file
"user unknown."
A valid addressee results in the SMTP address being converted to a
Microsoft mail address. Any attachments received are automatically
uudecoded if necessary, and appear as attachments in the Microsoft Mail
Additional reference words: 3.00 pcmail
KBSubCategory: MailGWSMTP
Copyright Microsoft Corporation 1994.

[=] © 1994 Peter Langston []