Submission Service

Submission Service

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Documentation overview
Administrative Manual
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As of version 2.3.0, Dovecot provides an SMTP submission service, also known as
a Mail Submission Agent (MSA) . It is
currently implemented as a proxy that acts as a front-end for any MTA ,
adding the necessary functionality required for a submission service: it adds
the required AUTH support, avoiding
the need to configure the MTA for SASL authentication . More SMTP
capabilities like CHUNKING and SIZE are supported, without requiring the
backend MTA supporting these extensions. Other capabilities like 8BITMIME and DSN currently require support from the
backend/relay MTA.
The most notable feature that the proxy adds is the BURL capability . The main application of that
capability — together with IMAP and URLAUTH — is avoiding a duplicate upload of
submitted e-mail messages; normally the message is both sent through SMTP and
uploaded to the Sent folder through IMAP. Using BURL, the client can first
upload the message to IMAP and then use BURL to make the SMTP server fetch the
message from IMAP for submission, thereby avoiding a second upload. Few clients
currently support the BURL capability, but once it becomes available on the
server side, client developers will at least have some incentive to provide
support for this feature.
Currently, the submission proxy is still pretty basic. However, it will
provide a basis for adding all kinds of functionality in the (not so distant)
future. For the first time, it will be possible to act upon message
submission, rather than only message retrieval; e.g. plugins can be devised
that process outgoing messages somehow. Examples of the things that could be
implemented are adding Sieve filtering support for outgoing messages, or
implicitly storing submitted messages to the Sent folder. Once a plugin API
is devised, you can create your own plugins.
The following SMTP capabilities are supported by the Dovecot submission
service:
8BITMIME - Only if relay MTA provides
support
DSN - Only if relay MTA provides
support
Just add submission to the protocols= setting and configure the relay
MTA server. The submission service is a login service, just like IMAP, POP3 and Pigeonhole ManageSieve Server , so clients
are required to authenticate. The same authentication configuration shall also apply to submission,
unless you’re doing protocol-specific things, in which case you may need to
amend your configuration for the new protocol.
BURL support requires a working IMAP URLAUTH implementation. Details on
configuring Dovecot’s URLAUTH support can be found at
imap_urlauth_host .
The following settings apply to the Submission service:
submission_logout_format = in=%i out=%o
The SMTP Submission logout format string. The following variable substitutions
are supported:
Total number of bytes read from client
Total number of bytes sent to client
Number of commands received from client
ID of the current transaction, if any
The host name reported by the SMTP service (and other parts of Dovecot),
for example to the client in the initial greeting and to the relay server
in the HELO/EHLO command. Default is the system’s real hostname @ domain .
Configures the list of active workarounds for Submission client bugs. The
list is space-separated. Supported workaround identifiers are:
Implicitly login using the EXTERNAL SASL mechanism upon the first MAIL
command, provided that the client provides a valid TLS client certificate.
This is helpful for clients that omit explicit SASL authentication when
configured for authentication using a TLS certificate (Thunderbird for
example).
Allow using bare Mailbox syntax (i.e., without <...> ) instead of full path
syntax.
Allow one or more spaces or tabs between MAIL FROM: and path and between
RCPT TO: and path.
The maximum size of messages accepted for relay. This announced in the
SMTP SIZE capability. If not configured, this is either determined from
the relay server or left unlimited if no limit is known (the relay MTA
will reply with error if some unknown limit exists there, which is duly
passed to Dovecot’s client).
Maximum number of recipients accepted per connection (default:
unlimited).
The Dovecot SMTP submission service directly proxies the mail transaction to
the SMTP relay configured with the following settings:
Host name for the relay server (required).
Is the relay server trusted? This determines whether we try to send
(Postfix-specific) XCLIENT data to the relay server.
User name for authentication to the relay MTA if authentication is
required there (authorization ID).
Master user name for authentication to the relay MTA if authentication is
required there (authentication ID).
Password for authentication to the relay MTA if authentication is
required there.
Indicates whether TLS is used for the connection to the relay server. The
following values are defined for this setting:
An SMTPS connection (immediate SSL) is used.
The STARTTLS command is used to establish the TLS layer.
Configures whether the TLS certificate of the relay server is to be
verified.
Write protocol logs for relay connection to this directory for debugging.
See Rawlog for more details on rawlogs.
Like IMAP and POP3, the Submission login service supports proxying to multiple
backend Dovecot servers. The proxy configuration wiki page for POP3 and IMAP
applies automatically to Submission as well.
Please note that the login proxy described here is configured between two
Dovecot servers (e.g. director frontend and mail storage backend). This is
not the way to configure the relay connection between the Dovecot submission
service and the MTA! That is configured using the relay settings described in
the previous section. If you get this wrong, things will seem to work (at
least to some extent), but the service provided by Dovecot will be
effectively bypassed.
As of April 2019 there aren’t many clients that support the BURL extension.

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Service. It’s something that a lot of submissive say they are into giving. While it’s quite clear that the definition means that we are helping or doing work for someone, performing a kindness or favor, when we apply that term to D/s it tends to take on a more indepth role. Let’s explore some of the ways service submission exists in D/s relationships.

Meditating on these precepts offers me inspiration and guidance. I think of these as five bottomless practices that can be continually explored and deepened. They are not linear and have no value as theories or concepts. To be understood and realized, they have to be lived into and communicated through action.

Meditating on these precepts offers me inspiration and guidance. I think of these as five bottomless practices that can be continually explored and deepened. They are not linear and have no value as theories or concepts. To be understood and realized, they have to be lived into and communicated through action.

There is no right or wrong way to serve. I do think some slaves are more prone to reactive service and there are some slaves who are more proactive.

There is no right or wrong way to serve. I do think some slaves are more prone to reactive service and there are some slaves who are more proactive.

While the book isn’t very long, it is still full of amazing information and I do highly recommend it to any service-oriented s-type.

While the book isn’t very long, it is still full of amazing information and I do highly recommend it to any service-oriented s-type.

Well, there’s not really an App for service. Wouldn’t it be nice if there were? However, there are a lot of Apps out there that can make running your household (and your Master!) a lot easier!

Well, there’s not really an App for service. Wouldn’t it be nice if there were? However, there are a lot of Apps out there that can make running your household (and your Master!) a lot easier!

For the service submissive, one who gets their pleasure from serving in some capacity it's nice to have a section of your library reserved for books that can help you with improving and utilizing new methods to make your service more complete.

For the service submissive, one who gets their pleasure from serving in some capacity it's nice to have a section of your library reserved for books that can help you with improving and utilizing new methods to make your service more complete.

Service is any activity or function that you fill to make your dominant partner's life easier. This could be as simple as preparing their coffee, laying out their clothes for them or performing domestic chores. Yes, it does include the play and sex aspects of some relationships, but not all of them are wired this way.

Service is any activity or function that you fill to make your dominant partner's life easier. This could be as simple as preparing their coffee, laying out their clothes for them or performing domestic chores. Yes, it does
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