Test mode
Build the whole integration before you go live
Test keys accept every request a live key does, then simulate the outcome. Nothing reaches a real inbox and test mail never counts against your plan.
What you get
- Keys start with sn_test_ — your first one is ready at sign-up
- delivered@, bounced@ and complained@ addresses produce that outcome
- Webhooks and events fire just like live mail
- Up to 2,000 free test emails a day
curl -X POST https://sendneo.yorkermedia.com/api/emails \
-H "Authorization: Bearer $SENDNEO_TEST_KEY" \
-H "Content-Type: application/json" \
-d '{"from":"hi@mail.acme.com","to":["bounced@test.sendneo.dev"],
"subject":"Bounce check","text":"x"}'