What This Feature Does
The Inbox Testing add-on lets you check where your emails land—inbox or spam—across major email providers before sending to your full subscriber list. You'll get a detailed report showing placement results for Gmail, Outlook, Yahoo, and other providers.
When and Why You'd Need This
Use inbox testing when you want to verify your email will reach inboxes, especially:
Before launching a new campaign
After making significant changes to your email content or sending domain
When trying new subject lines or email formats
If you suspect deliverability issues
Step-by-Step Instructions
Enable the Inbox Testing Add-on
Click your profile icon in the top navigation bar
Select Settings
Click Add-ons in the settings menu
Scroll to find Inbox Testing
Toggle the switch to On
The add-on costs $25 for 10 tests. These tests do not count toward your email sending credits.
Run an Inbox Test
You can test any campaign type—newsletters, drip campaigns, or broadcasts. Tests work the same whether your campaign is a draft or already sent.
Option 1: From the Campaigns Table
Go to Campaigns in the navigation bar
Find your campaign in the list
Click the three-dot menu next to the campaign
Select Test Inbox Placement
Option 2: While Creating or Editing a Campaign
In the campaign review page, look for the Send Test Email button
Next to it, you'll see Test Inbox Placement
Click Test Inbox Placement
Option 3: From Campaign Overview
Open your campaign's overview page
Find the Send Test Email button
Next to it, click Test Inbox Placement
Start and Monitor the Test
Click Continue to start the test
SendX will send your email to seed inboxes across multiple email providers
Wait 1–2 hours for results (occasionally up to 3 hours)
View Your Report
Go to Settings > Add-ons > Inbox Testing
Click Reports
Check the test you want to view
What You'll See in Reports
Your report shows:
Which email providers were tested (Gmail, Outlook, Yahoo, etc.)
Percentage of emails that landed in the inbox
Percentage that went to spam or promotions tabs
Provider-specific results so you can see if one provider flags your emails more than others
Reports are saved permanently in your account for future reference.
Important Notes
Each test costs 1 credit from your 10-test bundle ($25)
You can run the same campaign through testing multiple times
Tests don't affect your actual sending reputation or domain health
You can purchase additional test bundles when you run out
If "Test Inbox Placement" doesn't appear in the menu, verify the add-on toggle is turned on in Settings
Common Questions
How long do tests take?
Most tests complete in 1–2 hours, though some may take up to 3 hours depending on provider response times.
Can I test drafts or only sent campaigns?
Both. You can test a campaign whether it's still in draft or has already been sent to your list.
Do inbox tests use my email sending credits?
No. Inbox tests use separate test credits and don't count toward your account's email sending limits.
What types of campaigns can I test?
All campaign types—newsletters, drip emails, and broadcast campaigns.
What happens when I run out of tests?
You can purchase additional test bundles at any time through the Inbox Testing add-on settings.
If you're experiencing persistent deliverability issues after testing, consider reaching out to SendX support for personalized guidance.