v0
email
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
Resend API error: Missing API key
SendGrid: 403 Forbidden - sender identity not verified
Email sent but not received
resend.emails.send is not a function
Domain not verified: add DNS records
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.
Meïr Ankri
Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews.
Jared Hasson
Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever
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.
Alvin Voo
I’ve watched the tech landscape evolve over the last decade—from the structured days of Java Server Pages to the current "wild west" of Agentic-driven development. While AI can "vibe" a frontend into existence, I specialize in the architecture that keeps it from collapsing.
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Dor Yaloz
SW engineer with 6+ years of experience,
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Supabase expert
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.
rayush33
JavaScript (React.js, React Native, Node.js) Developer with demonstrated industry experience of 4+ years, actively looking for opportunities to hone my skills as well as help small-scale business owners with solutions to technical problems
Taufan
I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms.
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Matt Butler
Software Engineer @ AWS
Stanislav Prigodich
15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
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.