---
title: Authenticated SMTP submission now available in beta
description: Send transactional emails through Cloudflare Email Service from any SMTP-capable application or mail client using authenticated SMTP submission on smtp.mx.cloudflare.net.
image: https://developers.cloudflare.com/changelog-preview.png
---

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## Authenticated SMTP submission now available in beta

Jun 08, 2026 

[ Email Service ](https://developers.cloudflare.com/email-service/) 

You can now send emails through **Cloudflare Email Service** using authenticated [SMTP submission](https://developers.cloudflare.com/email-service/api/send-emails/smtp/) on `smtp.mx.cloudflare.net:465`. SMTP joins the [REST API](https://developers.cloudflare.com/email-service/api/send-emails/rest-api/) and the [Workers binding](https://developers.cloudflare.com/email-service/api/send-emails/workers-api/) as a third way to send transactional email — useful for existing applications that already speak SMTP and language-native SMTP libraries (Nodemailer, `smtplib`, PHPMailer, JavaMail).

| Setting  | Value                                                                             |
| -------- | --------------------------------------------------------------------------------- |
| Host     | smtp.mx.cloudflare.net                                                            |
| Port     | 465 (implicit TLS)                                                                |
| AUTH     | PLAIN or LOGIN                                                                    |
| Username | api\_token                                                                        |
| Password | A Cloudflare API token (account-owned or user-owned) with **Email Sending: Edit** |

Submissions enter the same delivery pipeline as the REST API and Workers binding: identical [limits](https://developers.cloudflare.com/email-service/platform/limits/), automatic DKIM and ARC signing, and shared dashboard logs.

Send your first email with a single command:

Terminal window

```
curl --ssl-reqd \  --url "smtps://smtp.mx.cloudflare.net:465" \  --user "api_token:<API_TOKEN>" \  --mail-from "welcome@yourdomain.com" \  --mail-rcpt "user@example.com" \  --upload-file mail.txt
```

Refer to the [SMTP reference](https://developers.cloudflare.com/email-service/api/send-emails/smtp/) for authentication details, response codes, and language-specific examples.

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