Setting Up Inbox Rotation Without Tripping Filters

Setting Up Inbox Rotation Without Tripping Filters
One mailbox caps your safe volume around 30-50/day. Rotation scales it. Here's the build.

— Buy 3-5 secondary domains (not your brand domain) — .com or .co, aged a few days.
— Spin up 2 mailboxes per domain on Google Workspace or a provider like Mailreef.
— Warm every mailbox 14 days before adding to rotation.
— In Smartlead or Instantly, attach all mailboxes to one campaign; the tool round-robins sends.
— Keep per-mailbox daily cap at 30-40 even when rotating — rotation multiplies mailboxes, not per-box limits.

Pros
— 8 mailboxes safely send ~300/day combined
— One burned mailbox doesn't sink the campaign
Cons
— Mailbox + domain costs stack fast ($6-10/box/mo)
— More infra to monitor and warm

Verdict: The only honest way to scale volume. Don't cheat per-box caps. 4.5/5.

Who it's for: Teams needing 200+ daily sends without burning a domain.