Error Strings
Error strings should not be capitalized (unless beginning with proper nouns or acronyms) or end with punctuation, since they are usually printed following other context. That is, use fmt.Errorf("something bad") not fmt.Errorf("Something bad"), so that log.Printf("Reading %s: %v", filename, err) formats without a spurious capital letter mid-message. This does not apply to logging, which is implicitly line-oriented and not combined inside other messages.
accept hosts = +relay_from_hosts
control = submission
require message = relay not permitted
domains = +local_domains : +relay_to_domains
require verify = recipient
accept
accept hosts = +relay_from_hosts
control = submission
domains = +local_domains : +relay_to_domains
verify = recipient
accept authenticated = *
deny message = relay not permitted
SELECT '["1", "2"]'::jsonb ?| array['1','5','6'];