Root cause of the Jun 2026 deliverability collapse / 'no new sales':
opendkim.conf was in single-key mode with no InternalHosts, so it signed only
127.0.0.1. Transactional/cron mail (injected locally) was signed, but ALL
campaign mail -- injected over the Docker bridge from the Listmonk containers
(172.18.0.5 trucking, 172.18.0.25 healthcare) -- went out UNSIGNED. Gmail/Yahoo
require DKIM on bulk mail since Feb 2024, so cold campaigns were junked/blocked
(~23% delivery, 550-5.7.1). Proof: 2,620 campaign msgs that day, 0 DKIM sigs.
The correct table files already existed on the server but were never wired into
opendkim.conf. Fix points the daemon at key.table/signing.table and sets
InternalHosts/ExternalIgnoreList to trusted.hosts (which includes 172.16.0.0/12,
the Docker subnet). Fixes BOTH streams: HC submission ports 2526-2528 inherit
the global smtpd_milters and *@performancewest.net covers compliance@.
Verified by injecting from a Docker IP through port 25 and port 2526 -- both now
get 'DKIM-Signature field added'. Codified as new Ansible role 'mail' so it
can't silently regress (OpenDKIM was previously not in IaC at all).
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