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#### Settings specific to SMTP Submission### SMTP Submission logout format string:# %i - total number of bytes read from client# %o - total number of bytes sent to client# %{command_count} - Number of commands received from client# %{reply_count} - Number of replies sent to client# %{session} - Session ID of the login session# %{transaction_id} - ID of the current transaction, if any#submission_logout_format = in=%i out=%o# Host name reported by the SMTP service, 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.#hostname =# Maximum size of messages accepted for relay. This announced in the SIZE# capability. If not configured, this is either determined from the relay# server or left unlimited if no limit is known (relay will reply with error# if some unknown limit exists there, which is duly passed to our client).#submission_max_mail_size =# Maximum number of recipients accepted per connection (default: unlimited)#submission_max_recipients =# Workarounds for various client bugs:# whitespace-before-path:# Allow one or more spaces or tabs between `MAIL FROM:' and path and between# `RCPT TO:' and path.# mailbox-for-path:# Allow using bare Mailbox syntax (i.e., without <...>) instead of full path# syntax.## The list is space-separated.#submission_client_workarounds =# Relay server configuration:## The Dovecot SMTP submission service directly proxies the mail transaction# to the SMTP relay configured here.# Host name for the relay server (required)#submission_relay_host =# Port for the relay server#submission_relay_port = 25# Is the relay server trusted? This determines whether we try to send# (Postfix-specific) XCLIENT data to the relay server#submission_relay_trusted = no# Authentication data for the relay server if authentication is required#submission_relay_user =#submission_relay_master_user =#submission_relay_password =# SSL configuration for connection to relay server## submission_relay_ssl:# Indicates whether SSL is used for the connection to the relay server. The# following values are defined for this setting:## no - No SSL is used# smtps - An SMTPS connection (immediate SSL) is used# starttls - The STARTTLS command is used to establish SSL layer#submission_relay_ssl = no# submission_relay_ssl_verify:# Configures whether the SSL certificate of the relay server is to be# verified.#submission_relay_ssl_verify = yes# Write protocol logs for relay connection to this directory for debugging#submission_relay_rawlog_dir =# BURL is configured implicitly by IMAP URLAUTH# Part of the SMTP capabilities that the submission service can offer to the# client (as listed in the EHLO reply) depend on those capabilities also being# provided by the relay server. These capabilities currently are:## - 8BITMIME# - BINARYMIME# - DSN# - VRFY (always returns 252 without support)## By default, the submission service first connects to the relay server to# determine the support for such capabilities before sending the initial EHLO# reply to the client. If the list of capabilities returned by the relay server# is somehow unreliable or it is undesirable to start the connection to the# relay server before the first mail transaction is started, the backend# capabilities can be configured explicitly using the# submission_backend_capabilities setting. This is a space-separated list of# SMTP capability names. This setting is only relevant for capabilities that# depend on support from the relay server: including (or omitting) capabilities# that are not listed above has no effect. When this setting is explicitly set# to the empty string, none of the capabilities is enabled. To achieve the# default behavior, this setting must be left unconfigured.#submission_backend_capabilities =protocol submission {# Space-separated list of plugins to load (default is global mail_plugins).#mail_plugins = $mail_plugins# Maximum number of SMTP submission connections allowed for a user from# each IP address.# NOTE: The username is compared case-sensitively.#mail_max_userip_connections = 10}