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Documentation Index

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AutoSend x Auth0
Auth0 uses email for authentication flows like password resets, email verification, and passwordless login. By default, Auth0 uses its built-in email provider, but you can configure it to use AutoSend SMTP for better deliverability and email tracking.
If SMTP doesn’t work for your Auth0 tenant, you can call the AutoSend API directly from a Custom Email Provider Action instead. See Send emails from Auth0 with a Custom Email Provider Action.

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Prerequisites

Verified Domain

Make sure you have a verified domain added in AutoSend to send emails from.

API Key

Create a new API key for SMTP authentication or use the existing one.

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Configuration

2

Enable Custom Email Provider

Toggle Use my own email provider to enable custom SMTP configuration.
Supabase Step 2
3

Select SMTP Provider

Select SMTP Provider as your email provider type.
Supabase Step 3
4

Enter SMTP Credentials

Fill in the following settings:
FieldValue
From[email protected] (must match your verified domain)
SMTP Hostsmtp.autosend.com
SMTP Port587
SMTP Usernameautosend
SMTP PasswordYour AutoSend API key (AS_xxx)
Supabase Step 4
5

Save Configuration

Click Save to apply your SMTP settings.
6

Send a Test Email

After saving, click the Send Test button next to the Save button to send a test email and verify your configuration is working.You can also check the Email Activity dashboard to verify the email was sent through AutoSend.
Supabase Step 5

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Email Templates

Auth0 allows you to customize email templates for different authentication scenarios. Navigate to Branding → Email Templates to modify:
  • Verification Email - Sent when users need to verify their email address
  • Welcome Email - Sent after successful signup
  • Change Password - Sent for password reset requests
  • Blocked Account - Sent when an account is blocked
  • Passwordless Email - Sent for passwordless authentication (magic links/codes)
Auth0 email templates use Liquid syntax for dynamic content. Variables like {{ user.email }} and {{ url }} are replaced with actual values when the email is sent.

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Troubleshooting

  • Verify your SMTP credentials are correct - Check that your sender email domain is verified in AutoSend - Ensure the From address matches a verified domain - Check Auth0 logs for SMTP connection errors (Monitoring → Logs)
  • Double-check your API key is correct - Ensure you’re using autosend as the username - Verify your API key is active in the AutoSend dashboard
  • Verify the hostname is smtp.autosend.com - Try using port 465 with implicit TLS if port 587 fails - Check if your network blocks outbound SMTP connections
  • Ensure your domain has proper DNS records (SPF, DKIM, DMARC) - Use a professional sender name, not just “noreply” - Check your domain reputation in AutoSend
If SMTP fails after exhausting the steps above, switch to the API-based approach using Auth0’s Custom Email Provider Action. See Send emails from Auth0 with a Custom Email Provider Action.

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Next Steps

https://mintcdn.com/autosend-13920f5c/nx_wYfWx3qeZwg1C/icons/domain.svg?fit=max&auto=format&n=nx_wYfWx3qeZwg1C&q=85&s=9393f9f9b0f7029e6ba8acf2bc09d864

Verify Your Domain

Set up SPF, DKIM, and DMARC for better deliverability
https://mintcdn.com/autosend-13920f5c/nx_wYfWx3qeZwg1C/icons/email-activity.svg?fit=max&auto=format&n=nx_wYfWx3qeZwg1C&q=85&s=2ecad7369f217ee7d03c3d8dfdd36d22

Email Activity

Monitor your email delivery and engagement
https://mintcdn.com/autosend-13920f5c/nx_wYfWx3qeZwg1C/icons/webhook.svg?fit=max&auto=format&n=nx_wYfWx3qeZwg1C&q=85&s=14ad6675c71731ac04f786559a813ee1

Webhooks

Set up webhooks to track email events in real-time
https://mintcdn.com/autosend-13920f5c/nx_wYfWx3qeZwg1C/icons/smtp.svg?fit=max&auto=format&n=nx_wYfWx3qeZwg1C&q=85&s=d1993edda392d54c3f704a9a4bb04442

SMTP Introduction

Learn more about AutoSend SMTP configuration