Resend or SendGrid Integration Not Sending Emails
Your v0-generated Next.js application integrates with Resend or SendGrid for transactional emails, but emails are not being delivered. The API calls appear to succeed (or fail silently), but recipients never receive the emails. No bounce notifications or error logs indicate what went wrong.
This commonly occurs when v0 generates the email sending code but does not guide you through the necessary domain verification, API key configuration, and sender authentication steps required by email providers. Without proper DNS records and verified sender identities, emails are silently dropped or sent to spam.
The issue is compounded in serverless environments where email sending functions may time out before completing, and error handling may not surface the underlying API errors.
Error Messages You Might See
Common Causes
- Domain not verified — DNS records (SPF, DKIM, DMARC) not configured for your sending domain
- API key missing or invalid — RESEND_API_KEY or SENDGRID_API_KEY not set in environment variables
- Sender email not authorized — sending from an email address not registered in the provider's dashboard
- Free tier limitations — Resend free tier only allows sending to the account owner's email address
- Serverless function timeout — email API call takes too long and the function terminates before completion
- Missing await on async call — v0 generated the send call without await, so the function exits before the email is sent
How to Fix It
- Verify your domain — add the required DNS records (SPF, DKIM) from your email provider's dashboard to your domain registrar
- Set API keys — add RESEND_API_KEY or SENDGRID_API_KEY to your .env.local and Vercel environment variables
- Use a verified sender — for Resend, use onboarding@resend.dev for testing or verify your own domain first
- Add proper error handling — wrap email sending in try/catch and log the full error response from the API
- Await the send call — ensure
await resend.emails.send()is properly awaited in your API route handler - Check spam folder — initial emails from new domains often land in spam until reputation is established
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Get HelpFrequently Asked Questions
Why do my Resend emails not arrive?
Most likely your domain is not verified. Go to Resend Dashboard > Domains and add the required DNS records. Until verified, you can only send to the account owner's email.
Can I test email sending locally?
Yes, set RESEND_API_KEY in .env.local and send to your own email. For Resend free tier, you can only send to the email used to create your account.
How do I check if SendGrid actually sent the email?
Go to SendGrid Dashboard > Activity Feed to see the status of each email. Check for bounces, blocks, and spam reports.