Get SMTP credentials from your provider
Create an app password or SMTP credential in Google Workspace, Microsoft 365, Amazon SES, Mailgun, or your host.
Feature · Custom Sending Domain
Send form notifications and auto-replies from your own domain
Connect your own SMTP server once and every notification and auto-reply goes out from your address, through your provider.
- 500 free to start
- No credit card
- 30-sec setup
No backend to build
Your form posts to one splitforms endpoint — no server, API route, or SDK. splitforms is the backend.
Straight to your dashboard
Every submission is saved to a searchable dashboard and emailed to you — spam filtered before it lands.
Custom Sending Domain, built in
No glue code, no third-party middleman — it ships as part of splitforms and works from your first submission.
Copy-paste ready
Drop this into any project.
Replace YOUR_ACCESS_KEY with the key from your splitforms dashboard. No SDK to install, no build step — the same html you already write.
// Custom sending domain: Dashboard → Account → Sending domain (SMTP).
// Any SMTP provider works — Google Workspace, Microsoft 365, Amazon SES,
// Mailgun, Postmark, your host's mail server.
//
// Host: smtp.yourprovider.com
// Port: 587 (STARTTLS) or 465 (SSL)
// Username: [email protected]
// Password: an app password or SMTP credential
// From: "Acme" <[email protected]>
//
// Click "Send test" to confirm the credentials before saving. After that,
// notification emails and auto-replies for every form go out through your
// server, from your address. Your form markup does not change:
<form action="https://splitforms.com/api/submit" method="POST">
<input type="hidden" name="access_key" value="YOUR_ACCESS_KEY" />
<input type="email" name="email" placeholder="Email" required />
<textarea name="message" placeholder="Message" required></textarea>
<input type="checkbox" name="botcheck" style="display:none" tabindex="-1" />
<button type="submit">Send</button>
</form>How to set it up
How to set up Custom Sending Domain.
How custom sending domain flows through splitforms — what you do, what we do, and what lands in your inbox.
Enter them in Account → Sending domain
Host, port, username, password, and the from name and address. Click 'Send test email' to confirm the connection.
Submit a form
The next notification and auto-reply arrive from your address, sent through your SMTP server.
How custom sending domain works
How does splitforms handle Custom Sending Domain?
By default splitforms sends notification emails and auto-replies through its own mail infrastructure. A custom sending domain switches that to your own SMTP server, so the emails come from your address and go through the provider you already trust — Google Workspace, Microsoft 365, Amazon SES, Mailgun, Postmark, or your host's mail server. Route the same submission to an email inbox or a webhook at the same time — nothing here is one-or-the-other.
- Notifications and auto-replies sent from your own address
- Works with any SMTP provider — Workspace, Microsoft 365, SES, Mailgun, Postmark
- Your SPF and DKIM records vouch for the mail
What you get
What do you get with Custom Sending Domain?
Every reason below is the boring, reliable kind — the fundamentals of custom sending domain, built once and tested in production so you never have to.
- Test button checks the credentials before you rely on them
- Password encrypted at rest and never displayed again
- One setting covers every form on the account
How SplitForms works
What happens after someone submits your form?
splitforms receives the submission, filters spam, saves it to your dashboard and emails you — then, on paid plans, sends it on to your webhooks and integrations. No backend infrastructure to build.
Add your endpoint
Point your form to your unique SplitForms endpoint. That's it.
Receive submissions
We instantly capture and organize every submission in your inbox.
Route anywhere
Send data to email, spreadsheets, CRMs, webhooks, and 7,000+ apps.
No credit card required. Set up in under 60 seconds.
Connect & automate
Where can submissions go besides email?
On paid plans, submissions can also go to Slack, Discord, Google Sheets, Notion, Airtable, Zapier or any signed webhook — and splitforms works on the platforms you build on, from WordPress and Shopify to Next.js. With Stripe connected, your forms can take payments too.
NewTake payments on your formsDeposits, bookings, order forms — submitters check out through Stripe and the money goes straight to your Stripe account. Included on every paid plan.See plans →Common questions
Custom Sending Domain questions.
View all FAQsHow do I send form emails from my own domain?
Open Dashboard → Account → Sending domain (SMTP), enter your provider's SMTP host, port, username, password, and the from address, and click 'Send test email'. After that, notification emails and auto-replies for every form are sent through your server from your address.
Which SMTP providers work?
Any standard SMTP server: Google Workspace (with an app password), Microsoft 365, Amazon SES, Mailgun, Postmark, SendGrid, or your web host's mail server. Use port 587 with STARTTLS or 465 with SSL.
Which plan includes a custom sending domain?
It's included on the paid plans: Pro ($5/month) or Annual ($49/year). Without it, notification emails are still sent free on every plan through splitforms' own mail infrastructure.
Is my SMTP password stored safely?
It's encrypted at rest and only decrypted on the server when an email is sent. It is never shown again in the dashboard — to change it, enter a new one.
Will this improve deliverability?
It often helps, because mail comes from your own domain and your provider's reputation, with your SPF and DKIM records in place. Inbox placement still depends on the recipient's provider and can't be guaranteed.
Simple pricing
How much does splitforms cost?
Free gives you 500 submissions for $0 — no card, no time limit. Pro is $5/month for 5,000 submissions a month, and Annual is $49/year for 15,000 a month with every Pro feature.
Free
$0— 500 submissions
For side projects and indie devs.
- 500 free submissions
- Unlimited forms
- Email notifications included
- Smart spam filtering
- Submissions dashboard
- Redirect after submit
- MCP server included
Recommended
Pro
$5/ month
Billed monthly
Every paid feature, for agencies and growing products.
- 5,000 submissions / mo
- Unlimited forms
- Webhooks and integrations
- CC/BCC, auto-replies and routing
- File uploads with 500 MB storage
- Stripe payments on your forms
- 3 team seats
- Cancel anytime
Annual
$49/ year
About $4.08/mo, billed yearly
Every Pro feature with triple the volume — $0.27 per 1,000 at full use.
- 15,000 submissions / mo
- Unlimited forms
- Everything in Pro
- File uploads with 5 GB storage
- 3 team seats
- Priority email support
No credit card required on Free • Cancel anytime • Full pricing and FAQ