05 · Email Hosting

The email
platform that
does both.

Professional mailboxes on your domain — and a transactional API to send password resets, notifications, and receipts — unified in one dashboard. The only backend platform with real email hosting built in.

The problem
01

Two separate email products

Mailboxes and transactional sending are separate products with separate vendors, separate APIs, separate billing, and separate deliverability configurations. Everyone needs both. Nobody offers both.

02

Deliverability is a maze

SPF, DKIM, and DMARC records need to be configured correctly for emails to reach inboxes. Get any one of them wrong and your emails land in spam — or get silently dropped.

03

Transactional APIs are expensive

Most email APIs charge per-email at rates that become significant at scale. A high-traffic app sending welcome emails, receipts, and notifications can accumulate thousands in email costs alone.

Two products. One dashboard. One price.
📬

Mailbox Hosting

Professional email accounts on your domain. hello@yourcompany.com, support@yourcompany.com — however many you need. Works with any email client.

  • IMAP/SMTP — works with Gmail, Outlook, Apple Mail
  • Webmail interface included
  • Catch-all address and email aliases
  • Spam filtering built in
  • 25GB storage per mailbox
🚀

Transactional API

Send password resets, receipts, notifications, and campaigns via API. Reliable delivery, real analytics, and full control over your templates.

  • REST API and SMTP relay
  • Template management with variables
  • Open, click, and bounce tracking
  • Delivery event webhooks
  • Send from your own mailbox domain
Auto-configured deliverability

Emails that
land in
the inbox.

When you add your domain, we guide you through DNS record setup and auto-publish every record needed for proper email authentication. You go from zero to full deliverability in under 10 minutes.

SPF
Sender Policy Framework

Authorizes our servers to send email on behalf of your domain. Auto-published when you add your domain.

DKIM
DomainKeys Identified Mail

Cryptographically signs every outgoing email. Proves authenticity to receiving servers and protects against spoofing.

DMARC
Domain Message Authentication

Tells receiving servers what to do with emails that fail SPF or DKIM. Protects your domain reputation from abuse.

API
// Send a transactional email const response = await fetch( 'https://api.onvix.io/v1/email/send', { method: 'POST', headers: { 'Authorization': `Bearer ${ONVIX_KEY}`, 'Content-Type': 'application/json' }, body: JSON.stringify({ from: 'hello@yourcompany.com', to: 'user@example.com', template: 'welcome', variables: { name: 'Sarah', verify_url: 'https://...' } }) } ) // Response: { id: "msg_01J...", status: "queued" } // Webhook fires on delivery, open, click, bounce
How it works

From domain
to inbox in
10 minutes.

01
Add your domain

Enter your domain in the dashboard. We generate the DNS records you need to add — SPF, DKIM, DMARC, and MX records.

02
Verify and activate

Add the DNS records to your registrar. We verify them automatically and activate your domain within minutes.

03
Create mailboxes

Create as many mailboxes as you need. Configure them in any IMAP client — or use our webmail interface immediately.

04
Send via API

Use your API key to send transactional emails from the same domain. Your app sends from the same address as your team's mailboxes.

Email client support
Gmail Outlook Apple Mail Thunderbird Spark Any IMAP client
Unique advantage

We're the only BaaS that includes real email hosting. Every other platform makes you integrate a third-party email provider — a separate bill, separate API key, separate dashboard. We include it.

Free tier

2 mailboxes + 1,000 transactional emails/month. No credit card required.

Real world scenarios
Small business
Professional email without Google Workspace

A local business owner wants professional@theirbusiness.com email without paying for Google Workspace per seat. ONVIX gives them mailboxes on their domain, a webmail interface, and the ability to send order confirmations via API — all on the free tier initially.

SaaS app
Transactional and team email from one domain

A SaaS startup sends welcome emails, password resets, and weekly reports from noreply@theirapp.com via API, while their team uses support@theirapp.com as a real mailbox. Same domain, same dashboard, one platform.

E-commerce
Order receipts at scale without per-email fees

An e-commerce store sends 50,000 order confirmation emails per month. With per-email transactional APIs, that's $500+/month in email costs alone. ONVIX's flat pricing makes high-volume transactional email predictable and affordable.

Frequently asked
What's the difference between the two products?
+
Mailbox hosting provides email accounts you access via IMAP/SMTP — like Gmail, but on your own domain. Transactional email is an API you call from your application to programmatically send emails like password resets and order receipts. Most platforms offer one or the other. We offer both in a single product.
Do you configure SPF, DKIM, and DMARC?
+
Yes, automatically. When you add your domain, we generate the exact DNS records you need. Adding them takes under 5 minutes. We verify them, monitor them, and alert you if they ever stop working — so your deliverability never silently breaks.
What email clients work with the mailbox hosting?
+
Any IMAP/SMTP client: Gmail (Add Account), Outlook, Apple Mail, Thunderbird, Spark, and any mobile email app. We also provide a webmail interface accessible from any browser — no desktop client needed.
Can my app send emails from my team's domain?
+
Yes. Transactional emails send from the same domain as your mailboxes. Your customers receive password resets from noreply@yourcompany.com and can reply to support@yourcompany.com — all using the same domain, properly authenticated.
Is there a sending limit for transactional email?
+
Free tier: 1,000 emails/month. Paid plans scale up significantly. We don't throttle sends in a way that would affect normal transactional email patterns (password resets, receipts, notifications). Bulk marketing email to cold lists is not permitted.
What's in the free tier?
+
2 mailboxes (25GB each) plus 1,000 transactional emails per month. Both the mailbox hosting and transactional API are available on the free tier. No credit card required to start.
Early Access

Professional email. Free to start.

All five products include a generous free tier. No credit card required. Pricing announced at launch — early waitlist members lock in founding rates.

1,400+ builders already signed up · Free tier, always