01
Accept
One API call, validated before it queues.
Send from your own domains with DKIM signing, dedicated IP pools and a delivery record for every single recipient. No black box, no shared reputation you cannot see, no guessing why a message did not arrive.
Domain verification takes about five minutes. New accounts are reviewed by a person before they can send to the outside world.
Five stages between your API call and an inbox. Scroll through them.
One API call, validated before it queues.
DKIM with per-domain RSA-2048 keys.
The right IP, chosen per message.
Straight to the recipient MX, on port 25.
Every outcome, in the receiver’s own words.
We check the key, the scope, that the From domain is verified and unsuspended, that no recipient is on a suppression list, and that you are inside your rate limit — before the message enters the queue. An idempotency key means a retried request never sends twice.
The things that decide whether mail arrives, built in rather than bolted on.
RSA-2048 per domain, two selectors from day one. Keys live in our zone behind a CNAME, so rotation never asks anything of your customers.
Separate pools keep one sender’s mistakes away from everyone else. Warmup caps are enforced in code, not documented in a wiki nobody reads.
Every record your customers publish points at a hostname we control. If an IP is blocklisted we change one record of ours — nobody else has to do anything.
Every message, recipient, delivery outcome, authentication attempt and admin action is recorded. Ask who sent what, from which IP, with which credential — and get an answer.
Hard bounces and complaints are suppressed permanently and checked before a message is ever accepted. A shared spamtrap list protects everyone on an IP.
Sending throttles above a 5% bounce rate and pauses above 10%, automatically. Cheaper than a blocklisting that takes a week to undo.
A REST API with snake_case JSON, stable error codes and a request id on every response — so a support question is one lookup, not a conversation.
Prefer SMTP? Point your existing client at
smtp.inboxquarry.com on 587, 465 or 2525. Both paths run the same
validation, the same signing and the same audit trail.
# send
curl https://api.inboxquarry.com/v1/messages \
-H "Authorization: Bearer sk_live_…" \
-H "Content-Type: application/json" \
-d '{
"from": "billing@yourdomain.com",
"to": ["customer@example.com"],
"subject": "Your invoice",
"html": "<p>Thanks!</p>",
"idempotency_key": "inv_991"
}'
# 202 Accepted
{ "id": "msg_01M0J8…", "recipients": 1 }Every plan includes DKIM, suppression, the full audit trail and the API. You are not charged extra for the parts that make mail arrive.
Sandbox is free and unlimited in time: add domains, verify DNS and send to addresses you have verified, so you can finish an integration before paying for anything.
Add it, publish the records we generate, verify. Five minutes.
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