allow_ip_literal — allow IP addresses in email addresses
allow_ip_literal = true
This directive instructs Momentum to respect (or reject) IP addresses in e-mail addresses. If this option is set to
false, email addresses such as email@example.com will not deliver successfully as the DNS system will not allow 192.168.0.1 to resolve to an email address. If this option is set to
true, the DNS system will resolve any domain in IPv4 form to the email address that it represents and messages addressed to that "domain" will be attempted normally.
The default value for this option is
This option is checked at reception time, rather than at delivery time. Once accepted and spooled, messages with a literal IP domain will never be subject to the
allow_ip_literal is valid in the global, listener, listen, peer, pathway, and pathway_group scopes.