Everything email. One calm control plane.
Ship transactional email, operate a collaborative inbound inbox, and run targeted broadcasts—backed by domain verification, durable retries, signed webhooks, and traces that explain exactly what happened.
250 2.0.0Accepted by destination server842msFrom the first API call to the final reply
Use one set of domains, contacts, events, and delivery data across every email workflow.
Reliable messages without a black box.
Send through a clean REST API or the dashboard, schedule for later, attach files, and follow the exact SMTP journey.
/api/emails202Turn inbound email into team workflow.
Receive on verified domains, route and label messages, assign owners, leave notes, and reply from the address your customer used.
Order updateassigned to Maya
NEWNeed help with setup2 internal notes
OPENInvoice #2048resolved by Alex
DONECampaigns with consent built into the path.
Import contacts, create segments, test subjects, schedule broadcasts, and keep unsubscribes and suppressions enforced.
Your weekly updateLeading · 54%
BWhat shipped this weekVariant · 46%
All the pieces, already connected
No separate campaign tool, inbound mailbox, DNS checker, and delivery debugger to stitch together.
Delivery API
Queue transactional messages from your product or the dashboard.
- HTML, text, CC, BCC, and attachments
- Scheduled sends and idempotency keys
- Reusable templates with escaped variables
- Domain-scoped live and test API keys
Inbound & shared inbox
Receive mail on your domains and give the team one place to work it.
- Per-domain inboxes and remembered filters
- Assignments, notes, labels, and presence
- Reply, snooze, star, archive, and trash
- Routing rules and branded custom hostnames
Marketing
Build an audience, target the right people, and understand engagement.
- CSV contacts, audiences, and segments
- Immediate or scheduled broadcasts
- A/B subject tests and engagement reports
- Unsubscribes, opt-outs, and suppressions
Domains & deliverability
See exactly what DNS needs and whether it is still healthy.
- SPF, DKIM, DMARC, and inbound MX
- Automatic checks while viewing a domain
- MTA-STS and TLS reporting guidance
- Domain history, folders, and ordering
Operations & diagnostics
Follow every message and every integration without losing the evidence.
- Exact SMTP stage, code, and provider reply
- Attempt history and five-day retry window
- Raw message and EML downloads
- Webhook delivery log, testing, and replay
Teams & security
Keep account and tenant boundaries explicit as your team grows.
- Roles and per-member inbox permissions
- Authenticator 2FA and backup codes
- Tenant-isolated data and audit history
- Usage, billing, and account administration
A clear view of every email workflow
Inspect delivery, collaborate on inbound messages, and read campaign performance without leaving Hivsy.
The exact answer when a send fails.
See the failed stage, provider response, recipients, timing, and every retry. Resend, inspect raw data, or download the original EML from the same view.
- Exact SMTP response preserved
- Per-recipient failure detail
- Retry and webhook history
[QA] Your order was updated
Syntax error, cannot decode responseA shared inbox organized around your domains.
Keep domains separate, remember the selected receiving address, and let teammates assign, label, discuss, and reply with live presence.
- Folders and domain organization
- Member-level domain and label access
- Optional branded inbox hostname
From contacts to measurable broadcasts.
Build reusable audiences and segments, test subject variants, schedule delivery, and follow opens and clicks while honoring opt-outs.
- CSV import and authenticated export
- A/B subject holdouts
- Suppressions and unsubscribe enforcement
August product update
Active customers · 8,420 recipientsOne request to send. Complete context when you need it.
Start with a small JSON payload. Add templates, attachments, scheduling, or custom headers when the product needs them. Every accepted message returns an ID you can trace.
const response = await fetch(
'https://api.hivsy.com/api/emails', {
method: 'POST',
headers: {
Authorization: 'Bearer hsl_live_…',
'Idempotency-Key': order.id,
'Content-Type': 'application/json'
},
body: JSON.stringify({
from: 'Acme <hello@acme.com>',
to: [customer.email],
template_id: '5266867d-9729-49c5-adef-06c2113f292a',
variables: { name: customer.name }
})
}
);
// 202 Accepted · id is ready to trace
const { id, status } = await response.json();202 · queuedRetries, evidence, access, and isolation
The operational details are product features—not support tickets waiting to happen.
Transient failures retry for up to 5 days.
Every attempt stays attached to the message, including timing, stage, and the exact response preserved for diagnosis.
Control access without slowing the team.
Protect accounts, keys, domains, and inbox data with clear boundaries at every layer.
Start free. Buy capacity when you need it.
Free allowance resets monthly. Paid email credits never expire, with no subscription required.
3,000 / month
2 domains60,000 credits
12 domains80,000 credits
24 domains120,000 credits
Unlimited domainsBring sending, inbound, and marketing together.
Start with 3,000 free emails per month and two verified domains. No credit card required.