The 9 AM Rule · Interactive Simulator

The single biggest deliverability lever.

Every major CRE email platform sends in the same 4-hour window — 9 AM to 1 PM Eastern. Which means a broker in Los Angeles gets your blast at 6 AM, before they've finished their coffee. Routing by time zone instead is the most reliable open-rate boost in the industry. Try the math.

Your scenario.

Total recipients 5,000
Geographic distribution
East40%
Central30%
Mountain10%
Pacific20%
Send time (standard mode)
Open-rate model based on aggregate CRE-email benchmarks across 2024-2026. Individual campaign results vary with content quality, list hygiene, and subject line.
Smart routing vs standard
+1,150 extra opens. Same blast.

Routing your blast to each recipient's local 9 AM — instead of one fixed 9 AM ET — captures the entire network during peak attention. Below is the breakdown by time zone.

+1,150
Extra opens
+33%
Open-rate lift
+9
Estimated extra replies
Standard send · industry default

Everyone at 9 AM ET.

All recipients receive the email at the same UTC moment. East Coast sees it at 9 AM; Pacific gets it at 6 AM, before they're in the inbox.

1,790opens
35.8% open rate
Smart routing · BLACKBOOK CRE default

Everyone at their local 9 AM.

Each recipient gets the email at peak local attention — 9 AM in their own time zone. Same blast, four different UTC delivery windows.

2,250opens
45.0% open rate

When the email lands in each zone

Smart routing is the default on BLACKBOOK CRE.

Every blast is automatically routed by recipient time zone. No extra cost, no setup. You get the open rate the industry leaves on the table.

Create your first blast  →

How the numbers work.

The open-rate curve below is derived from aggregate transactional and broadcast email data across CRE platforms. Your mileage will vary — but the shape of the curve is consistent across operators we've benchmarked against.

01

Peak window

9-10 AM local time delivers ~48-52% open rates on average. Recipients are at their desk, triaging their inbox before meetings start. The single highest-attention window of the day.

02

Early-morning penalty

An email landing at 6-7 AM gets ~12-25% opens. Most people aren't in their inbox yet; by the time they are, your subject line has been buried by 80 other emails.

03

Post-lunch dip

1-3 PM is the worst attention window of the workday — meetings, deal calls, post-lunch energy slump. Open rates drop to 22-28% before recovering slightly at 3-4 PM.