Send email from Render

HTTPS isn't blocked on any instance type. There are two ways to send through Groundmail from Render:

Prerequisites

• A Groundmail account with a verified sending domain. A subdomain such as mail.yourdomain.com works well.
• An API key (gm_…) from API keys in the dashboard.

Send with the API

In the Render dashboard, open your service's Environment page, add GROUNDMAIL_API_KEY with the key as its value, and save. Render redeploys the service with it. Then send with an SDK.

Node.js

npm install groundmail

import { Groundmail } from 'groundmail'

const groundmail = new Groundmail(process.env.GROUNDMAIL_API_KEY)

await groundmail.emails.send({
  from: 'App <no-reply@mail.yourdomain.com>',
  to: 'user@example.com',
  subject: 'Reset your password',
  html: '<p>Click the link to reset your password.</p>',
})

Already on Nodemailer? Swap the SMTP transport for the Nodemailer transport, which sends over HTTPS, and keep your sendMail calls.

Python

pip install groundmail

import os
from groundmail import Groundmail

groundmail = Groundmail(os.environ["GROUNDMAIL_API_KEY"])
groundmail.emails.send(
    from_="App <no-reply@mail.yourdomain.com>",
    to="user@example.com",
    subject="Reset your password",
    html="<p>Click the link to reset your password.</p>",
)

Go, PHP and Ruby have SDKs too: see SDKs. Any other language can call POST https://api.groundmail.dev/emails with the key: see the API reference.

Keep SMTP

If your app can only send over SMTP, point it at Groundmail's relay on port 2525:

Add these as environment variables on the service, using the names your app reads. On a paid instance type, port 587 works too. See SMTP.

Troubleshooting