Send Fillout mail through SecureSMTP

Q: Which From address will people see?

Without a verified sending domain, mail goes out from hello@send.securessmtp.com with your sender name, and the original From address becomes the Reply-To. With a verified sending domain (Starter plan or higher), mail goes out from the address you set for that domain.

Fillout custom emails can be sent from your own SMTP server (Team and Enterprise plans). Enter our SMTP settings there.

SMTP setupLiveForms

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Setup

Fillout has its own SMTP fields. Enter our SMTP settings there; the password is your site’s API key.

1
Create a SecureSMTP account
Sign up at securessmtp.com/signup. The Free plan includes 5,000 emails a month. No card needed.
2
Add a site and copy its API key
Dashboard → Sites → + Add website. The last step shows the site’s API key (it starts with qcs_live_). It is shown only once, so copy it. The API keys page (/app/forms/api-keys) also shows the SMTP settings.
3
Enter the SMTP settings in Fillout
Fillout (Team and Enterprise plans): open the form → Integrate → Workflows and choose an email template (or open Custom emails from the form settings). Click Recipients, and under “Send email from” choose “Send from your SMTP server +”. Enter host smtp.securessmtp.com, port 587 (or 465), username securessmtp and your site API key as the password.
4
Send a test
Submit the form once. The email shows up in the Email log in your dashboard.
5
Optional: send from your own domain
Without a verified domain, mail goes out from [email protected] with your sender name, and your From address becomes the Reply-To. To send from your own address, add a sending domain (Starter plan or higher) and publish its DKIM record. See securessmtp.com/docs/guides/domains-and-dns.

SMTP settings

Host       smtp.securessmtp.com
Port       587 (STARTTLS) or 465 (SSL/TLS)
Username   securessmtp
Password   your site's API key (Dashboard → Sites)
Auth       PLAIN or LOGIN

What you get

DKIM-signed email

Every email is signed with DKIM. With a verified sending domain it is signed as your domain, so DMARC passes for your domain.

Spam check before sending

Each email goes through a content check and an AI spam check before it leaves, so junk form posts do not go out under your name.

Email log and events

Every email is in the dashboard Email log with its status. Delivered, bounced, opened and clicked events can be posted to your server by webhook.

Retries on temporary errors

If the receiving server asks us to try again later, we keep trying and send an email.delayed event.

FAQ

How long does setup take?

A few minutes: add a site, then enter the SMTP settings in Fillout. Sending from your own domain adds one DNS record.

Which From address will people see?

Without a verified sending domain, mail goes out from [email protected] with your sender name, and the original From address becomes the Reply-To. With a verified sending domain (Starter plan or higher), mail goes out from the address you set for that domain.

What happens if SecureSMTP cannot be reached?

The API call or SMTP login fails and the platform or automation tool shows the error; most automation tools can retry a failed step. Once we accept an email, we keep retrying if the receiving server asks us to try again later.

Can I send from my own domain?

Yes, on the Starter plan or higher. Add a sending domain in the dashboard and publish one DKIM TXT record (the advanced setup adds two more records). Emails sent from a verified domain do not count toward the monthly limit.