/etc/exim4/conf.d/router/100_exim4-config_domain_literal is in exim4-config 4.82-3ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ### router/100_exim4-config_domain_literal
#################################
# This router handles e-mail addresses in "domain literal" form like
# <user@[10.11.12.13]>. The RFCs require this facility, but it is disabled
# in the default config since it is seldomly used and frequently abused.
# Domain literal support also needs to be enabled in the main config,
# which is automatically done if you use the enable macro
# MAIN_ALLOW_DOMAIN_LITERALS.
.ifdef MAIN_ALLOW_DOMAIN_LITERALS
domain_literal:
debug_print = "R: domain_literal for $local_part@$domain"
driver = ipliteral
domains = ! +local_domains
transport = remote_smtp
.endif
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