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
Real developers can help you.
David Olverson
Solo dev shipping production apps with AI-assisted development. I specialize in rescuing broken Lovable/Bolt/Cursor builds and taking them to production. 10+ apps shipped including SaaS CRMs, gaming platforms, real estate tools, and Discord bots. Stack: Next.js 16, TypeScript, Tailwind CSS, FastAPI, PostgreSQL, Prisma. I use Claude Code with 50+ custom skills for rapid delivery. Average turnaround: 2-4 weeks from broken prototype to production.
Luca Liberati
I work on monoliths and microservices, backends and frontends, manage K8s clusters and love to design apps architecture
Jen Jacobsen
I’m a Full-Stack Developer with over 10 years of experience building modern web and mobile applications. I enjoy working across the full product lifecycle — turning ideas into real, well-built products that are intuitive for users and scalable for businesses.
I particularly enjoy building mobile apps, modern web platforms, and solving complex technical problems in a way that keeps systems clean, reliable, and easy to maintain.
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Developer with 8 years of experience building softwares fro startups
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Software Engineer @ AWS
Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
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I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
Richard McSorley
Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures.
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I am a Full Stack Developer experienced in building Websites, Web apps and Cross Platform Mobile Apps for Startups and Companies.
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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.