Nextsend
Transactional email, done properly

Email your users actually receive.

Nextsend is the independent transactional email platform from Nexthomelabs — a clean API, an SMTP relay, and deliverability tooling that treats your sender reputation like production infrastructure.

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  • Works from any host
  • API + authenticated SMTP
  • SPF, DKIM & DMARC checks
  • Signed webhooks

ProperOutbox accounts and sessions are separate from Nexthomelabs.

POST /v1/email/send
curl https://api.properinbox.com/v1/email/send \
  -H "Authorization: Bearer $KEY" \
  -d '{ "from": "billing@acme.com",'
     "to": ["ava@customer.com"],
     "subject": "Your receipt" }'
  • email.queuedpi_msg_8f2a0.12s
  • email.sentsmtp.properinbox.com0.41s
  • email.deliveredava@customer.com1.08s
  • webhook.signedhttps://acme.dev/hooks1.14s

Everything between your code and the inbox

Production email infrastructure, without the enterprise maze.

Send password resets, receipts, and alerts through a platform built for application mail — isolated from human mailboxes, with keys, domains, and events you can actually inspect.

Transactional email API

One POST sends a message. Idempotency keys keep retries safe, and every send is tracked end to end.

SMTP relay

Point existing apps at smtp.properinbox.com with scoped credentials per environment. Ports 587 and 465.

Sending domains

Guided SPF, DKIM, and DMARC setup with live DNS health checks on every domain you add.

Analytics

Delivery, bounce, and complaint rates per domain, per stream, per day.

Event webhooks

Deliveries, bounces, and complaints pushed to your endpoints with signed payloads.

Reputation guardrails

Suppressions, blocklist monitoring, and DMARC reports keep your sender reputation intact.

Templates & logs

Design reusable templates and search full message logs whenever you need answers.

Scoped API keys

Production and test keys with per-project limits, rotated without downtime.

A clear path to first send

Three steps. Then your mail is in motion.

  1. 01

    Verify a sending domain

    Add your domain, publish SPF, DKIM, and DMARC, and watch live DNS health until the domain is ready to send.

  2. 02

    Send from your application

    Call the REST API with an idempotency key, or point existing software at the authenticated SMTP relay.

  3. 03

    Watch every message

    Queued, sent, delivered, bounced, or suppressed — logs, analytics, and signed webhooks stay in one console.

REST or SMTP

One POST. Idempotent. Tracked.

Authenticate with a Bearer API key at api.properinbox.com/v1. Reuse an idempotency key to make retries safe. Or keep your existing mailer and submit over TLS SMTP.

API
api.properinbox.com
SMTP
smtp.properinbox.com
STARTTLS
Port 587
Implicit TLS
Port 465
Read the API docs
202 Acceptedqueued
{
  "message_id": "pi_msg_8f2a91c4",
  "status": "queued"
}

Idempotent

Retries stay safe

Scoped keys

Per project, rotatable

Signed events

Webhooks you can trust

Nextsend or ProperInbox?

Application mail

Nextsend

Automated application email: password resets, verification codes, receipts, order confirmations, alerts and delivery notifications — sent by your software through the API or SMTP.

Human mailboxes

ProperInbox

Human staff mailboxes such as info@, support@ and sales@ on your company domain, with webmail, IMAP and SMTP. Compare ProperInbox and Nextsend.

Pricing

Works from applications hosted anywhere

Nextsend is not tied to NexHost. Buy it by itself and send from any application, on any host, through the API or SMTP. It can also be included in selected Nexthomelabs bundles.

Loading current catalog availability…

Higher-volume tiers and bundle pricing are available in the Nexthomelabs catalog.

Questions, answered

Must I host on NexHost to use Nextsend?

No. Nextsend works with applications hosted anywhere.

Can I buy Nextsend together with hosting and mailboxes?

Yes. Select a bundle on the Nexthomelabs pricing page and make one payment; every included product activates automatically.

Does NexHost Plus include transactional email?

Not by itself. Purchase Nextsend separately or choose a bundle that includes it.

Can I test before going production?

Yes. Start in the sandbox with test emails to verified recipients, then add a sending domain and go live.

Do I use the API or SMTP?

Either. REST submissions authenticate with a production API key at api.properinbox.com. SMTP submissions use generated credentials at smtp.properinbox.com on ports 587 and 465.

Is Nextsend the same as ProperInbox?

No. Nextsend is automated application email. ProperInbox is human staff mailboxes such as info@ and support@, with webmail, IMAP, and SMTP.

Start sending today

Ship the email your product depends on.

Create a ProperOutbox workspace, verify a domain, and send from the API or SMTP. Sandbox first. Production when you are ready.

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