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Hostname used in From addresses (SPF/DKIM should match this domain).

Outbound mail uses SMTP from that company’s Settings page once the domain exists.

Used for DNS checks at {selector}._domainkey for this domain.
SMTP login override (optional)
Leave blank to share the company's relay login. Set these to authenticate this subdomain as its own mailbox — required when multiple subdomains share one relay and each needs its own Envelope-From for clean DKIM/SPF alignment + per-domain bounce attribution.
Target maximum campaign sends per day after warmup (never above 30). While the domain is in warmup, only seed mail runs; volume follows warmup stages (e.g. 3–6/day at stage 1), not this number.

New domains start in warmup with lead assignment off. After graduation to Active, enable assignment here if you want this mailbox to take sequences.

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