Seed List & Inbox Placement

Know Where Your
Email Lands
Before They See It.

Q: What is a seed list and how does inbox placement testing work?

A seed list is a curated set of real email addresses at major mailbox providers (Gmail, Outlook, Yahoo, etc.) that InboxEagle controls. When you send a campaign to your list and include these seed addresses, InboxEagle monitors where the email landed — Inbox, Spam, or Promotions — at each provider and reports the results back to you within minutes.

Q: How do I add the seed list to my campaign?

InboxEagle provides a downloadable seed list CSV. Import those addresses into your ESP as a list or segment. Add them to any campaign you want to test. From that point on, every send that includes those addresses is automatically tracked in InboxEagle — no per-campaign setup required.

Q: How quickly do placement results appear after sending?

Results begin appearing within 2-5 minutes of your send, as InboxEagle's seed inboxes receive and classify the email. Full results across all 20+ providers are typically available within 10 minutes of the campaign being sent.

Q: Can I test placement before sending to my full list?

Yes. You can send exclusively to the seed list addresses as a pre-send test. This lets you verify inbox placement and review authentication headers before your campaign goes out to real subscribers — catching issues while you can still fix them.

Q: What does InboxEagle show beyond just Inbox / Spam / Promotions?

Each seed result includes: the placement classification, full email headers, authentication results (SPF, DKIM, DMARC pass/fail as seen by that provider), the spam filter verdict or reason code if available, and the time to delivery. This gives you full diagnostic context, not just a pass/fail label.

Real inbox placement testing across 20+ ESPs — Gmail, Outlook, Yahoo, Apple Mail, and more. See Inbox, Spam, and Promotions results within 5 minutes of sending, with full header analysis.

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Inbox Placement Results

4m ago

Gmail Inbox

Outlook Inbox

Yahoo Mail Inbox

Apple Mail Inbox

AOL Mail Spam

Hotmail Promotions

Overall Inbox Rate 66.7%

4 Inbox 1 Promotions 1 Spam

20+

ESPs Tested Per Send

< 5 min

Results After Send

100%

Inbox/Spam/Promo Coverage

Real-time

Placement Tracking

How It Works

Inbox Placement Results in Three Steps

Set up once, get placement data on every campaign automatically — no extra work per send.

Step 1 Ready

Add seed addresses to your list

InboxEagle provides a seed list of real mailboxes across 20+ ESPs — Gmail, Outlook, Yahoo, Apple Mail, and more. Add them to your campaign list once.

Step 2 Sent

Send your campaign normally

Send your campaign as you normally would. InboxEagle's seed inboxes receive the email alongside your real subscribers — no extra steps.

Step 3 Results

View placement results in minutes

Within 5 minutes of sending, InboxEagle shows you exactly where your email landed at each provider — Inbox, Spam, or Promotions — with full header analysis.

Features

Complete Inbox Placement Intelligence

Every placement signal you need to understand, diagnose, and improve email deliverability.

20+ Provider Coverage

Real inboxes at Gmail, Outlook, Yahoo, AOL, Apple Mail, iCloud, Comcast, and more — a comprehensive cross-provider placement snapshot every send.

5-Minute Results

Placement results appear within 5 minutes of your send — fast enough to catch problems before your campaign completes, not after.

Full Header Analysis

Every seed result includes full email header analysis — authentication pass/fail, routing path, and spam filter verdicts at each provider.

Historical Trend Tracking

Compare placement rates across campaigns over time — identify whether a content change, list segment, or infrastructure update improved or harmed inbox placement.

Placement Drop Alerts

Configure alerts for inbox rate drops below a threshold — get notified the moment a send routes to spam at a major provider.

Pre-send Testing

Test email placement before sending to your full list — catch spam triggers in your content or authentication issues before they affect real subscribers.

The Difference

Guessing Placement vs. Knowing Placement

Without seed testing, spam folder routing is invisible until engagement metrics collapse.

Without InboxEagle

Open rate crashed 40% — spam routing undiscovered for weeks

No visibility into Inbox vs. Spam vs. Promotions
Deliverability issues discovered via low open rate
No per-provider breakdown — all ESPs look the same
No pre-send testing to catch issues before sending
Header analysis requires manual forwarding and parsing

With InboxEagle

Inbox Rate: 94%

Inbox, Spam, and Promotions results in 5 minutes
Per-provider breakdown across 20+ ESPs
Pre-send test before full campaign goes out
Full header analysis with authentication verdicts
Historical placement trends across all campaigns

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Stop Guessing. Start Knowing Where Every Email Lands.

InboxEagle seed testing gives you placement results across 20+ providers within minutes of every send — with zero extra work on your end.