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What is a Local Delivery Agent?
==============================
!!! This is deprecated
The part of SMLMP that connects to Postfix is a mail delivery agent,
abbreviated as "LDA". Basically, it expects certain environment
variables as described below to be set. SMLMP's LDA expects the
following environment variables to be correctly set by Postfix when it
is called.
LOCAL The local-part of the final recipient address.
DOMAIN The domain-part of the final recipient address.
As a special requirement, this must also be the
domain-part of all mailing list addresses due to
a technical limitaiton.
ORIGINAL_RECIPIENT The original recipient when Postfix is told to
handle the message.
Note that this does not include all original
recipients, it just states the original
recipient that "caused" Postfix to deliver it
to our LOCAL.
SENDER The SMTP envelope sender, as opposed to the From
or Sender header in the email content. This is
used for bouncing.
These are not used by SMLMP as of the time of writing:
RECIPIENT* Full final recipient address.
MAIL_CONFIG* Usually just /etc/postfix.
EXTENSION* The subaddressing extension of the final
recipient address. We don't actually use this
environment variable, we care about the
subaddressing extension in ORIGINAL_RECIPIENT
instead, which we would parse ourself.
(For background information on what
subaddressing is, consult the comment above the
"recipient_delimiter" option in the example
smlmp.conf.)
The "finial recipient address" is not standard terminology. Here it
refers to the primary address that SMLMP is in charge of, after postfix
handles all aliases and routing. Our LDA sits at the final recipient
address and processes messages sent to it.
Important: The LDA expects to receive the content of the message to
deliver on standard input.
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