Lovable Email Not Sending Fix

Map the email path before changing settings

Email in a Lovable app can come from more than one place. That is why random setting changes often make the problem worse. A signup confirmation may be sent by Supabase Auth. A receipt, invite, order update, or notification may be sent by a generated function that calls Resend, SMTP, or another email provider. A branded sender domain may sit above either flow.

Start by naming the exact message that failed. Do not debug email as one bucket. Write down whether the missing email is an auth message, a custom transactional email, or a marketing-style notification generated by your own app logic. Then find the trigger that should have sent it: account creation, password reset request, database insert, payment success, status change, or manual button click.

The cheapest useful test is to separate delivery failure from execution failure. If the send function never ran, SPF, DKIM, DMARC, and spam folders are not the first problem. If the send function ran and the provider accepted the message, the problem moves to domain authentication, sender reputation, recipient filtering, or template data.

If there is no provider event and no send-path log, stay inside the app. Check the trigger, the generated function, the environment variable names, and the branch that decides whether to send. If there is a provider event, move outward to sender domain, from address, recipient handling, and provider status.

Verify the domain and the from address together

Domain verification is not just a deliverability polish step. In Lovable email setups, it is often the line between a message that providers accept cleanly and a message that gets delayed, rejected, or filtered. The important detail is that the domain and the visible from address must agree with the provider configuration.

If you configured a custom sender domain, check the DNS records required by the email provider. That usually means SPF and DKIM records, and often a DMARC record. The exact values must match the provider screen. A copied record with an extra space, missing host value, or stale value from a previous provider can leave the domain in an unverified state.

Then check the from address used by the app. If your verified domain is example.com, sending from hello@anotherdomain.com is a different trust problem. If the generated code hard-coded an old from address, the dashboard may look correct while the live app still sends from the wrong identity.

This is also where default sender behavior matters. Default Supabase sender emails may work for early testing, but they are not a reliable substitute for a verified production sender when real users, branded auth, and transactional messages are involved. If confirmation emails land in spam or never arrive for some recipients, moving to an authenticated domain is not cosmetic. It changes how receiving mail systems evaluate the message.

Check the sender value in every place it can be defined: Lovable project email settings, Supabase Auth email settings, the Resend or SMTP configuration, and the generated send function. One wrong hard-coded value can override the clean setup you see in the dashboard.

Check the Resend or SMTP secret the app actually uses

A Resend integration can look connected while the deployed function is reading the wrong secret. The same applies to SMTP credentials. Lovable can generate useful wiring, but generated code still depends on exact environment variable names, project-level secrets, and deployed runtime access.

Open the function or server action that sends the email and inspect the variable name it reads. If the code expects RESEND_API_KEY, the project must expose that exact key name to the environment where the function runs. RESEND_KEY, RESEND_TOKEN, or a key saved only in a local preview context will not satisfy that lookup.

For SMTP, confirm the host, port, username, password, and security mode as a matched set. Port 465 typically expects implicit TLS. Port 587 typically expects STARTTLS. A mismatch can produce timeouts or authentication errors that appear as a generic failed send in the app UI.

Do not rotate keys repeatedly until you have confirmed what error comes back. A bad key, missing key, wrong region, blocked sender, and malformed payload are different problems. The provider response is the evidence. If your app swallows that response and only shows a toast like Email sent, add temporary logging around the provider call until you can see the status code and error body.

If the app sends from preview but fails after deployment, treat that as an environment difference until proven otherwise. Preview and production can differ in secrets, callback URLs, allowed domains, and function deployment state. Email code that passes one context is not automatically proven in the other.

Separate Supabase Auth emails from transactional emails

Lovable apps commonly use Supabase for authentication. That means signup confirmations, magic links, password resets, and email change confirmations may follow Supabase Auth settings rather than your custom transactional email function. If a password reset fails, debugging an order-confirmation function will not help.

For auth emails, check the Supabase Auth email configuration first. Confirm the site URL, redirect URLs, sender settings, and SMTP configuration if you replaced the default sender. A wrong redirect URL can make an email appear broken even when delivery succeeds, because the user clicks the link and lands on an invalid or unexpected destination.

For transactional emails, inspect the application logic. A receipt or notification usually depends on a trigger: a database record is inserted, a status changes, a payment callback arrives, or a user clicks a button. If that trigger does not fire, the email provider never receives a request.

This distinction matters because the logs live in different places. Auth delivery can show up through Supabase-related auth behavior and email provider events. Transactional delivery requires checking the generated function, database trigger, API route, or server-side action that calls the email provider. A single app can have both systems working differently on the same day.

When an auth email fails, prove the Supabase Auth settings first. When a transactional email fails, prove the app executed the send function first.

Do not let the word email hide two different mechanisms. Label each failing message and follow the mechanism that owns it.

Fix pending and silent transactional failures

The hardest Lovable email failures are the ones that sit pending or fail silently. The UI may claim a notification was queued. The database may show a row that looks ready. The user still receives nothing. That usually means the app has a state-management problem, an async handling problem, or a send function that records pending before it proves delivery.

Open the browser dev tools and reproduce the action. In the Network tab, filter for Fetch/XHR. If clicking the button or completing the workflow does not create a request to the endpoint that sends email, the UI is not wired to the send path. If the request exists and returns a 401, 403, 404, or 500, the HTTP response is the next thing to fix.

Then check server logs for the function or route. Look for the line immediately before the provider call and the line immediately after it. If the first line appears and the second does not, the provider call may be throwing or timing out. If both lines appear but no provider event exists, verify the API key, endpoint, and payload. If the provider event exists but the app row remains pending, your database update after send is broken.

Generated code can also create duplicate or nearly identical send functions. One function may be wired to the button. Another may contain the new Resend key. A third may update the email status table. Search the codebase for the recipient email, provider import, API key variable, and status value such as pending, sent, or failed. Remove ambiguity before adding another function.

A safer transactional pattern records clear states. Create the notification row as pending. Attempt the provider send. If the provider accepts the message, save sent and the provider message ID. If the provider rejects it, save failed and the error message. Without that state transition, every failure becomes a ghost hunt.

For more general rescue work on this platform, the Lovable rescue page explains how AppStuck approaches unfinished and broken Lovable builds. If your app also involves generated React code, it may help to understand the moving pieces on the React side, especially when buttons, forms, and async state do not match the backend behavior.

Lovable email not sending questions

Why does Lovable say the email is pending but nothing arrives?

Pending usually means your app recorded an intent to send before it proved that the provider accepted the message. Check whether the send function actually ran, then check the provider dashboard for an event. If there is no provider event, debug the trigger, endpoint, secret name, and server logs. If there is a provider event, debug the from address, domain verification, recipient address, and delivery result.

Do I need Resend for Lovable transactional email?

You need a real transactional email provider or SMTP service for production-style transactional email. Resend is a common choice because Lovable has integration support for it, but the important requirement is not the brand name. The app needs a provider key, a verified sender identity, a working server-side send path, and error handling that records failures instead of hiding them.

Why do Supabase Auth emails work but my custom emails fail?

Supabase Auth emails and custom transactional emails can use different configuration and different code paths. Auth emails may be controlled by Supabase Auth settings, while receipts or notifications may be sent by a generated function calling Resend or SMTP. If auth emails work, that proves only the auth path. It does not prove your custom trigger, API key, payload, or transactional template.

Why do my Lovable emails work in preview but not production?

Preview and production can use different environment variables, deployed functions, redirect URLs, and domain settings. Confirm that the production runtime has the same secret names the code reads, that the sender domain is verified, and that the deployed function is the one your UI calls. Treat preview success as a useful signal, not as proof that production has the same configuration.

Should I keep using the default Supabase sender?

The default Supabase sender can be acceptable while testing auth flows, but it is a weak foundation for real branded traffic. For production, use an authenticated sender domain and a provider configuration you control. That gives you clearer ownership of SPF, DKIM, DMARC, from addresses, provider logs, and delivery troubleshooting when users report missing messages.

Email is finished only when the app can prove what happened: triggered, attempted, accepted, delivered or failed with a visible reason. If your Lovable build cannot show that chain, keep the fix focused on evidence instead of prompts.