Windsurf
email
Email Attachments Not Sending in Windsurf App
Emails sent from your Windsurf-generated app arrive without their attachments, with empty attachments, or with corrupted files that can't be opened. The email itself sends successfully, but the attached file is missing or broken.
This commonly happens with invoice PDFs, receipt exports, user-uploaded files, and generated reports that your app needs to send via email. Cascade may have configured the attachment incorrectly, pointing to a file that doesn't exist in production, using wrong encoding, or hitting size limits.
The issue is hard to debug because the email send operation typically succeeds without errors — the problem only becomes apparent when the recipient opens the email and finds the attachment missing or corrupted.
Error Messages You Might See
Email sent successfully (but attachment missing)
Error: ENAMETOOLONG or ENOENT for attachment path
552 Message size exceeds maximum permitted
Attachment shows 0 bytes in received email
Cannot open attachment: file is corrupted
Common Causes
- File path doesn't exist in production — Cascade used a local file path (/tmp/report.pdf) that exists during development but not in the serverless production environment
- Wrong content encoding — Binary file content passed as a UTF-8 string instead of a Buffer, corrupting binary attachments
- Attachment size exceeds SMTP limit — Most SMTP providers limit messages to 10-25MB total including base64 encoding overhead (which increases file size by ~33%)
- Missing content-type header — The attachment doesn't specify the correct MIME type, causing email clients to ignore or mishandle it
- Async file generation not awaited — The PDF or report is generated asynchronously but the email sends before the file is ready
How to Fix It
- Use Buffer content instead of file paths — Pass attachment content as a Buffer instead of a file path: attachments: [{ filename: 'report.pdf', content: pdfBuffer }]
- Set content-type explicitly — Always include contentType in attachments: { filename: 'report.pdf', content: buffer, contentType: 'application/pdf' }
- Await file generation before sending — If generating a PDF or report, await the generation and verify the buffer is not empty before attaching
- Check total message size — Calculate base64 size (file size * 1.37) and ensure total message stays under your SMTP provider's limit
- Log attachment details — Before sending, log the attachment filename, content type, and buffer length to verify the attachment is properly formed
- Test with a simple file first — Attach a small text file to verify the attachment mechanism works, then move to binary files
Real developers can help you.
Prakash Prajapati
I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.
AUXLE
I am a Full Stack Developer experienced in building Websites, Web apps and Cross Platform Mobile Apps for Startups and Companies.
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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I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well.
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I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms.
Over the past years, I’ve worked across startups and fast-moving teams, leading backend architecture, improving system reliability, and shipping products used by thousands of users. My strength is not just writing code — but connecting product vision, technical execution, and business impact.
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’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.
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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.
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Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : )
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Get HelpFrequently Asked Questions
Why does the email send successfully but the attachment is missing?
Nodemailer silently ignores attachment errors in some cases. If the file path doesn't exist or the content is undefined, the email sends without the attachment. Always verify the attachment content exists and has length > 0 before calling sendMail().
What is the maximum attachment size for email?
Most SMTP providers limit total message size to 10-25MB. Since attachments are base64-encoded (adding ~33% overhead), a 7MB file becomes ~9.3MB in the email. For large files, include a download link instead of attaching the file directly.