Kinde Auth: Connecting custom AutoSend SMTP for branded B2B invitations and SSO verification

API & SMTP Integration
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How do you configure Kinde Auth’s custom SMTP settings so all enterprise workspace invitations and login OTPs send from your verified corporate domain using AutoSend?

2

Kinde Auth + AutoSend Custom SMTP Configuration

Kinde Auth provides built-in support for external custom SMTP providers to route transactional authentication traffic (enterprise workspace invites, passwordless magic links, and login OTPs) through your own verified sending domain.

1. AutoSend SMTP Credentials Setup

Ensure your sending domain (e.g. auth.yourcompany.com or mail.yourcompany.com) is verified in AutoSend with active SPF and DKIM TXT records.

Retrieve your SMTP credentials:

  • Host: smtp.autosend.com
  • Port: 587 (STARTTLS) or 465 (TLS/SSL)
  • SMTP Username: autosend (always the literal string autosend)
  • SMTP Password: Your dedicated AutoSend SMTP Key (generated in your AutoSend dashboard under Project Settings > SMTP tab, format AS_...).

2. Configure Custom SMTP in Kinde Dashboard

  1. Log in to your Kinde Dashboard.
  2. Navigate to Settings > Email > Custom email provider.
  3. Select Custom SMTP.
  4. Configure the SMTP connection fields:
    • Host: smtp.autosend.com
    • Port: 587
    • Encryption: TLS / STARTTLS
    • Username: autosend
    • Password: your_autosend_smtp_key
    • Sender Email: auth@yourcompany.com (must match a domain verified in AutoSend)
    • Sender Name: Your Company Auth / Acme Identity
  5. Click Save and test connection to dispatch a test verification email.
  6. Once the test succeeds, toggle Use for all environments (or configure per production/staging environment) to route all user invitations and SSO verification emails through AutoSend.

3. Deliverability & Domain Alignment

Routing through AutoSend maintains strict SPF (v=spf1 include:amazonses.com ~all), DKIM, and DMARC alignment under your corporate domain, preventing B2B invitation emails from landing in enterprise spam filters or quarantine.

Relevant Documentation