PDF attachment getting corrupted when sent via Mailgun

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1

I’m having trouble with Mailgun in my Node.js app. When I try to send a PDF attachment, it arrives corrupted at the recipient’s end. The original file is fine, but something goes wrong during transmission.

Here’s a simplified version of my code:

const attachment = {
  data: fs.readFileSync('document.pdf'),
  filename: 'document.pdf',
  contentType: 'application/pdf'
}

const emailData = {
  from: '[email protected]',
  to: '[email protected]',
  subject: 'Important Document',
  text: 'Please find the attached PDF.',
  attachment: [attachment]
}

mailgunClient.messages().send(emailData, (err, response) => {
  // Handle response
})

I’ve double-checked the file path and made sure the PDF is valid. What could be causing this issue? Has anyone encountered something similar or know how to fix it?

2

hey bro, i had a similar prob with mailgun. try encoding ur pdf to base64 before sendin. it worked for me. also, make sure ur using the latest mailgun sdk version. older ones can be buggy with attachments. good luck!

3

I’ve encountered a similar issue with Mailgun and PDF attachments. The problem might be related to how you’re reading the file. Instead of using fs.readFileSync(), try using fs.createReadStream(). This approach can handle larger files more efficiently and might prevent corruption.

Here’s a modified version of your code that could work:

const attachment = {
  filename: 'document.pdf',
  contentType: 'application/pdf',
  data: fs.createReadStream('document.pdf')
}

// Rest of your code remains the same

Also, ensure you’re using the latest version of the Mailgun SDK. Older versions had some known issues with attachments. If the problem persists, you might want to check your Mailgun API settings or try encoding the file to base64 before sending.

4

I’ve dealt with this exact issue before, and it can be frustrating. One thing that worked for me was using a buffer instead of directly reading the file. Try modifying your code like this:

const fs = require(‘fs’);
const path = require(‘path’);

const pdfPath = path.join(__dirname, ‘document.pdf’);
const pdfBuffer = fs.readFileSync(pdfPath);

const attachment = {
data: pdfBuffer,
filename: ‘document.pdf’,
contentType: ‘application/pdf’
};

This approach ensures the entire file is loaded into memory before sending, which can prevent corruption issues. Also, double-check your Mailgun API key and domain settings. Sometimes, incorrect configurations can lead to unexpected behavior with attachments. If the problem persists, you might want to try a different email service provider to rule out any Mailgun-specific issues.