Know where an email lands before you commit to sending it.
Send your email to a set of seed accounts and see exactly where it ends up, inbox, spam, or somewhere in between. Sendbox reports back an inbox rate, a spam rate, and an overall score so you know whether you're actually ready to launch.
Lambda Group
Test placement before it costs you a single lead.
Know your inbox placement before a campaign ever goes live, instead of burning leads to find out you're in spam.
Inbox rate, spam rate, and an overall score, simple numbers you can actually act on.
Watch your test move from pending through sending and monitoring to completed, so you always know exactly where it stands.
Adjust your email and run the test again, iterating for as long as it takes to get placement right.
Test before you send, launch only once you are ready.
Pick the email you want to check and kick off a placement test right from your dashboard. It goes out to seed accounts spread across all the major providers.
The test moves through pending, sending, monitoring, and completed, and you can watch its status the whole way through.
Once it wraps up, you get back an inbox rate percentage, a spam rate percentage, and an overall placement score.
Test every campaign before it goes live. Discovering you're landing in spam after 5,000 emails have already gone out is expensive. Discovering it beforehand costs nothing.
Swap the subject line, tweak the body copy, and run the test again. You'll see exactly which changes move you out of spam and into the inbox.
Just finished warming up a new domain? Run a placement test to confirm you're genuinely hitting inbox before your first real campaign goes out.
Catch placement problems before they cost you leads.
Know your placement before a single lead gets burned
A lot of cold email platforms skip inbox placement testing entirely, so you send your campaign and just hope for the best. Sendbox lets you test first instead, fixing issues while the cost of doing so is still zero.
Fix placement problems before they cost you leads
Most teams find out they're landing in spam only after a campaign has already gone out and the reply rates come in terrible. By that point the damage is done and the leads are already burned. Placement testing lets you catch and fix that before a single campaign email leaves the building, when the cost of fixing it is still nothing.
Clear results, not a wall of data
Inbox rate, spam rate, an overall score, that's the whole picture, with no complicated charts to interpret or cryptic metrics to decode. High inbox rate and low spam rate means you're clear to launch; anything else means it's time to tweak and test again.
Got questions? We've got answers.
Still stuck? Talk to us →Your email goes out to seed accounts spread across email providers, and Sendbox checks where each one landed before reporting back an inbox rate, spam rate, and overall placement score.
Related pages
More Testing
Explore Sendbox
Compare & decide
Ready to land in primary?
Get your own isolated Sendbox setup running and start sending inside 15 minutes.
Every plan includes a dedicated IP. Cancel whenever you want.