Function: resolveEmailConfig()
resolveEmailConfig(
config?):ResolvedEmailConfig
Resolve plugin config over environment defaults.
When SMTP host + user + password are all present, returns mode: "smtp" for real delivery (and throws if no sender source - domain,
from, or systemFrom - is configured, since SMTP can’t derive one from
nothing; domain alone is the intended minimum).
When all three are absent and EMAIL_OUTBOX_MODE is enabled, returns
mode: "file" so the runtime writes messages to the outbox directory
for local testing; in that mode a sender source is optional (the
outbox falls back to the OBO user’s own address). Partial SMTP
configuration or a send with no credentials and no outbox opt-in
throws.
The sender allow-list is resolved here too: under the default
"allowlist" policy an empty list is filled in from the sender source,
so a deployment that only sets EMAIL_DOMAIN still rejects a From on
any other domain. See SenderPolicy.
Parameters
Section titled “Parameters”config?
Section titled “config?”EmailPluginConfig = {}