SMTP Relay

Connect any application via standard SMTP. Use your existing tools — no code changes required.

SMTP Settings

Host: smtp.grosend.com
Port: 587 (STARTTLS) or 465 (SSL/TLS)
Username: your-api-key
Password: your-api-key

Example: Node.js (Nodemailer)

Node.js

const nodemailer = require('nodemailer');

const transporter = nodemailer.createTransport({
  host: 'smtp.grosend.com',
  port: 587,
  secure: false,
  auth: {
    user: 'sv_live_your_key',
    pass: 'sv_live_your_key',
  },
});

await transporter.sendMail({
  from: 'hello@yourdomain.com',
  to: 'user@example.com',
  subject: 'Hello from Grosend',
  html: '<h1>Sent via SMTP!</h1>',
});

Example: Python

Python

import smtplib
from email.mime.text import MIMEText

msg = MIMEText('<h1>Sent via SMTP!</h1>', 'html')
msg['Subject'] = 'Hello from Grosend'
msg['From'] = 'hello@yourdomain.com'
msg['To'] = 'user@example.com'

with smtplib.SMTP('smtp.grosend.com', 587) as server:
    server.starttls()
    server.login('sv_live_your_key', 'sv_live_your_key')
    server.send_message(msg)

Example: curl

Terminal

curl --url "smtp://smtp.grosend.com:587" \
  --ssl-reqd \
  --mail-from "hello@yourdomain.com" \
  --mail-rcpt "user@example.com" \
  --user "sv_live_your_key:sv_live_your_key" \
  -T email.eml

When using SMTP, your API key serves as both username and password. The sender address must be from a verified domain.