/var/list/.etc/rc.rfc822 is in smartlist 3.15-22.
This file is owned by list:list, with mode 0o644.
The actual contents of the file can be viewed below.
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# RFC822 address parsing regular expressions for procmail.
#
# Copyright (c) 1997-2002 Barton E. Schaefer
# spacex__ below is a space and a tab
specialx__ = '][()<>@,;:\\".'
spacex__ = " "
specials__ = "[$specialx__]"
atom__ = "[^$specialx__$spacex__]+"
space__ = "[$spacex__]*"
qtext__ = '[^"\\]'
qpair__ = '\\.'
beginq__ = '"'
endq__ = '[^\\]?"'
dotx__ = '\.'
dot__ = "$space__$dotx__$space__"
comma__ = "$space__,$space__"
domainref__ = "$atom__"
domainlit__ = "\[([^]]|$qpair__)*[^\\]?\]"
quotedstring__ = "$beginq__($qtext__|$qpair__)*$endq__"
word__ = "($atom__|$quotedstring__)"
phrase__ = "($space__$word__$space__)*"
localpart__ = "$word__($dot__$word__)*"
subdomain__ = "($domainref__|$domainlit__)"
domain__ = "$subdomain__($dot__$subdomain__)*"
addrspec__ = "$localpart__$space__@$space__$domain__"
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