The sm-archive.conf configuration file is specified by this partial bnf description.
CONFIG     = {ENV-FROM ENV-TO}+
ENV-FROM   = env_from "{" LIST "}" ";"
ENV-TO     = rcpt_to  "{" LIST "}" ";"
LIST       = ELEMENT {LIST}+
ELEMENT    = ADDRESS TARGET ["remove"] ";"
ADDRESS    = (USER@ | DOMAIN | USER@DOMAIN)
TARGET     = ("" | USER@DOMAIN)