SMTP Contact Form That Actually Reaches the Inbox
A contact form is only useful if the email arrives. VASTROX Forms sends every submission over authenticated SMTP with DKIM and SPF signing, so your messages land in the inbox instead of the spam folder, and you can skip the SMTP setup entirely if you want.
Why SMTP contact forms end up in spam
Most broken contact forms are not broken at all. The email is being sent, but it is getting silently filtered. This happens when mail leaves an unauthenticated server, when the sending domain has no SPF record, or when messages are not DKIM signed. Providers like Gmail and Outlook quietly drop or spam-bin anything that looks unverified.
The usual fix is to configure an SMTP relay, manage credentials, publish DNS records, and hope the alignment is correct. That is real work, and one wrong record sends everything back to spam. VASTROX Forms handles the delivery layer so you do not have to debug DNS to receive a message.
Point your form at VASTROX and you are done
You do not need a server, a mail library, or SMTP credentials. Create a form, copy your endpoint ID, and set it as the form action. Every submission is sent to your inbox from our authenticated, DKIM and SPF signed infrastructure.
This works with plain HTML, so it drops into any static site, framework, or landing page with no build step.
<form action="https://forms.vastrox.com/YOUR-ID" method="POST">
<label>Email
<input type="email" name="email" required>
</label>
<label>Message
<textarea name="message" required></textarea>
</label>
<button type="submit">Send</button>
</form>Prefer your own SMTP? Bring it
If you already run a mail server or use a provider like your own relay, you can point VASTROX Forms at it. Add your host, port, and credentials in the dashboard and submissions are relayed through your SMTP instead of ours, while we still handle spam filtering, validation, and the form parsing.
This gives you full control over the sending domain and reputation, without writing any backend code to accept and process the POST.
Deliverability handled by default
Every email we send on your behalf is DKIM signed and passes SPF, with proper envelope alignment so receiving servers trust it. That is the single biggest reason messages reach the inbox rather than the junk folder.
Because VASTROX also runs hosting and email infrastructure, the same delivery pipeline that powers our mail products signs your form notifications. You get inbox-grade deliverability without configuring a single DNS record.
Send confirmations back to the visitor
An SMTP contact form is not just about you receiving mail. You can enable an auto-reply so the person who submitted the form gets an immediate, signed confirmation from your address. This reassures visitors that their message went through and reduces duplicate submissions.
Set the reply-to on the notification you receive so hitting reply goes straight back to the sender, with no copy-pasting addresses.
<form action="https://forms.vastrox.com/YOUR-ID" method="POST">
<input type="email" name="email" required>
<input type="text" name="name" required>
<textarea name="message" required></textarea>
<!-- honeypot: leave empty, bots fill it -->
<input type="text" name="_gotcha" style="display:none">
<button type="submit">Send message</button>
</form>Frequently asked questions
Do I need SMTP credentials to use VASTROX Forms?
No. By default we send every submission from our own authenticated, DKIM and SPF signed servers, so you never touch SMTP settings. If you want to send from your own mail server, you can add your SMTP host, port, and credentials in the dashboard.
Why do my current contact form emails go to spam?
Almost always because the mail is unauthenticated. Without SPF and DKIM, receiving providers cannot verify the sender and filter the message. VASTROX Forms signs every email it sends, which is what gets messages into the inbox.
Will this work on a static site with no backend?
Yes. The form is plain HTML that posts to your VASTROX endpoint, so it works on static hosts, single page apps, and any framework without a server or serverless function.
Can I use my own sending domain?
Yes. Connect your own SMTP in the dashboard and submissions are relayed through your mail server, so email is sent from and signed by your domain while we still parse and filter the form.
How do I stop spam submissions?
Add a hidden honeypot field to your form and VASTROX Forms will silently discard entries that fill it, along with built-in spam filtering on our side. No CAPTCHA is required.
Is VASTROX Forms free?
Yes, the hosted form backend is free to use. It ties into the wider VASTROX hosting and email platform if you later want managed sending on your own domain.
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