This class executes the last stage of message transformation to be sent through the list. Transformation
processes by this class are done in the following order:
• Classifies recipients for whom message is delivered by each reception mode, filters recipients by
topics (see also Sympa::Spool::Topic), and choose message tracking modes if necessary.
• Transforms message by each reception mode.
• Enables DMARC protection (according to "dmarc_protection" list configuration parameter), message
personalization (according to "personalization_feature" list configuration parameter) and/or re-
encryption by S/MIME (if original message was encrypted).
• Alters envelope sender of the message to list"-owner" address.
Then stores message into outgoing spool (see Sympa::Spool::Outgoing) with classified packets of
recipients.
This class updates statistics information of the list (with digest delivery, Sympa::Spindle::ToOutgoing
will update it).