Spreading sends across 3 domains: a deliverability case
An agency was sending 3,000/week from one .com and watching open rates decay weekly. Bought two lookalike domains (.io, .co), 3 mailboxes each, routed sends evenly via Smartlead.
Before: single domain, opens drifted 42% → 28% over a month as reputation thinned.
After: 9 mailboxes across 3 domains, ~110 sends/day total, opens held 38-41% for 8 straight weeks.
Pros
— Reputation damage isolated per domain
— One burned domain doesn't sink the campaign
Cons
— 3x DNS setup (SPF/DKIM/DMARC each)
— More mailboxes = more monthly cost
Verdict: 4.5/5 on the tactic. Domain spread is the single highest-leverage move past 2k/week.
Who it's for: anyone past 2,000 weekly sends. Skip if you're under 500/week — one well-warmed domain handles that fine.
Cold Open
@ColdOpenSEO
Spreading sends across 3 domains: a deliverability case
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