Drop-in SMTP relay
Auth0's custom SMTP fields point straight at NoticeAPI's implicit-TLS relay on port 465.
Point Auth0 at NoticeAPI for verification, reset, and MFA email
Auth0 decides what account email to send, but by default you can't see whether it landed. Point your tenant's custom SMTP provider at NoticeAPI and every verification, reset, and MFA message sends from your verified domain, into the same logs, suppressions, and signed webhooks as the rest of your mail.
Shortest working path
Auth0 custom SMTP settings
SMTP host: smtp.noticeapi.com SMTP port: 465 TLS/SSL: enabled Username: noticeapi Password: ntc_xxxxxxxxxxxxxxxxxxxx From: Accounts <[email protected]>
Connect it, test it, then move traffic.
- 1
Verify the sender domain
Add your sending domain in NoticeAPI and publish its SPF and DKIM records.
- 2
Create the SMTP credential
Generate an API key (ntc_ prefix) and use it as the SMTP password.
- 3
Configure Auth0
In Auth0, choose custom SMTP and set host smtp.noticeapi.com, port 465, TLS on, and your From address.
- 4
Test the auth flows
Trigger a verification, reset, and MFA email, then watch each one resolve in the logs.
What remains visible after integration.
Your verified domain
Verification, reset, and MFA mail sends from a domain you prove with SPF and DKIM.
Every send, in the logs
Each Auth0 message lands in NoticeAPI logs, so support can read accepted, delivered, bounced, and suppressed for any account.
Signed delivery events
Signed webhooks push each outcome into your support desk or account systems as it happens.
NoticeAPI delivers the email; Auth0 stays your identity system
Auth0 decides what account email to send and to whom. NoticeAPI is the delivery path for it, not a replacement: it does not manage your users, login policies, or mailboxes.
Read the implementation.
Questions before you ship.
Does NoticeAPI replace Auth0's email templates?
No. Auth0 still decides what account email to send and renders it. NoticeAPI is the SMTP delivery path underneath, plus the logs and events on top.
Can support use the logs when a user says the email never arrived?
Yes. Auth0's SMTP sends enter the NoticeAPI send path, so each one shows up in the logs and recipient timeline with its delivery state.
Can I send marketing email over this SMTP too?
No. This path is for transactional identity email. For subscribed-audience sends, use NoticeAPI broadcasts and audiences.
Test it. Then send for real.
Simulator outcomes are free. Move to a verified domain when the path is ready.