Global kill switches and send-loop tuning. Per-campaign quotas + windows live on each email campaign.
dry_run logs but doesn't send.
Max emails sent per loop tick (across all campaigns).
How often the send loop wakes up to drain due assignments.
Default From name + address used by every campaign.
Cost dial — applies to every ingestion run.
Verifies the saved sender works. In dry-run, logs only. In live, sends to the address below.