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.
Caio Rodrigues
I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures.
I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations.
Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization.
I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems.
My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.**
Anthony Akpan
Developer with 8 years of experience building softwares fro startups
Rudra Bhikadiya
I build and fix web apps across Next.js, Node.js, and DBs.
Comfortable jumping into messy code, broken APIs, and mysterious bugs.
If your project works in theory but not in reality, I help close that gap.
ISHANTDEEP SINGH
Senior Software Engineer with 7+ years of experience in React, JavaScript, TypeScript, Next.js, and Node.js. I’ve also worked as a tech lead for startups, owning end-to-end technical execution including architecture, development, scaling, and delivery. I bring a strong mix of hands-on coding, product thinking, and technical leadership, and I’m comfortable building products from scratch as well as improving and scaling existing systems.
Franck Plazanet
I am a Strategic Engineering Leader with over 8 years of experience building high-availability enterprise systems and scaling high-performing technical teams. My focus is on bridging the gap between complex technology and business growth.
Core Expertise:
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I thrive on "out-of-the-box" thinking to solve complex technical bottlenecks and am always looking for ways to use automation to improve business productivity.
legrab
I'll fill this later
PawelPloszaj
I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
Tejas Chokhawala
Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript.
Focused on performance, clean architecture and shipping fast.
Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools.
Pratik
SWE with 15+ years of experience building and maintaining web apps and extensive BE infrastructure
BurnHavoc
Been around fixing other peoples code for 20 years.
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.