this file has been deprecated for a while and will not be updated, so

lets just remove it as some people may believe it actually describes
the architecture ...

1 files changed, 0 insertions, 105 deletions

diff --git a/usr.sbin/smtpd/ARCHITECTURE b/usr.sbin/smtpd/ARCHITECTURE
deleted file mode 100644
index 0214305de1d..00000000000
--- a/usr.sbin/smtpd/ARCHITECTURE
+++ /dev/null
@@ -1,105 +0,0 @@
-+==============================+
-|The SMTP Daemon Architecture  |
-+==============================+
-
-Introduction
-------------
-
-The SMTP daemon is a complete mail architecture designed to provide
-an MTA and MDA for OpenBSD systems (and others!).
-
-The SMTP daemon is configurable through a simple pf-like syntax to
-select external or local delivery and the means to do so.
-
-The SMTP Daemon relies on a fully asynchronous and event based data
-transfer model. The IMSG pseudo-protocol is used throughout the daemon
-to provide communication between separate privilege-separated
-processes.
-
-The following processes are currently implemented:
-
-	* smtp:		The unprivileged SMTP server
-	* mfa:		Mail filter agent
-	* queue:	A queue scheduler
-	* mda:		Local mail delivery agent
-	* mta:		Remote mail delivery agent
-	* lka:		Lookup agent: handles DNS, db, file and external maps
-	* control:	External interaction gateway
-
-The SMTP Server
----------------
-
-The SMTP Server conforms to RFC 5321 and also provides interesting
-extensions such as STARTTLS (RFC 2487).
-
-
-The Mail Filter Agent
----------------------
-
-The mail filter agent has two roles. First it decides if a mail is
-allowed to be delivered by the daemon, and then performs resolution
-to determine the delivery method that applies to the mail, either
-local or remote. The second duty is to perform optional modifications
-on the envelope content.
-
-
-WorkFlow
---------
-
-The base structure that traverses most of smtpd's architecture is a
-struct msg. The typical workflow is as shown below from left to right:
-
-+------+                                          +-----+
-| SMTP |======+                               +===| MDA |
-+------+      |     +-----+     +-------+     |   +-----+
-              |=====| MFA |=====| Queue |=====|
-                    +-----+     +-------+     |   +-----+
-                      ||                      +===| MTA |
-                    +-----+                       +-----+
-                    | LKA |
-                    +-----+
-
-
-Client -> Server workflow:
-
-1- The message is initially received from either the listening service or
-   /usr/sbin/sendmail (for which smtpctl is a link).
-
-2- As envelope is gathered, the information is handed out to MFA for
-   validation.
-
-3- MFA takes decision as to whether or not the message can be delivered
-   locally or relayed out and notifies SMTP of its decision.
-
-4- If message is not rejected, a file descriptor is requested from QUEUE
-   by SMTP which will then write the message to the file descriptor.
-
-5- Once content is written, SMTP notifies QUEUE that the content is
-   fully written and provides a list of recipients.
-
-6- QUEUE constructs batches of messages with same message ID and going
-   to same destination, and registers them to the batch queue. It then
-   writes the information on-disk so that it can recover from a crash
-   or shutdown, and notifies SMTP that message is accepted.
-
-7- SMTP notifies client that message was accepted.
-
-
-Queue workflow:
-
-1- A batch queue traversal is done. For each batch, QUEUE computes the
-   retry time based on the number of times it was tried already and
-   the time of last attempt. A batch may be in three states:
-
-	a) It is either ready for processing, in which case it is
-	   handed to MDA or MTA for delivery attempt.
-
-	b) The delay before next retry has not yet expired, the
-	   scheduler will simply ignore it.
-
-	c) The batch age (currently 4 days) has expired. The
-	   scheduler will eventually generate a mailer daemon batch
-	   and remove the original batch from the queue.
-
-
-XXX - needs to be completed/improved/updated