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SparkPost Attachment Type Not Supported

The email contains an attachment with an unsupported file type.

Understanding SparkPost: A Powerful Email Communication API

SparkPost is a leading email delivery service that provides a robust API for sending and managing emails. It is widely used by developers and businesses to ensure reliable email communication. SparkPost offers features like real-time analytics, advanced email templates, and high deliverability rates, making it an essential tool for any application requiring email functionality.

Identifying the Symptom: Attachment Type Not Supported

When using SparkPost, you might encounter an error indicating that an attachment type is not supported. This typically manifests as a failure to send an email or a specific error message returned by the API. The error can disrupt email communication, especially if attachments are a critical part of your emails.

Common Error Messages

Some common error messages related to unsupported attachment types include:

  • "Attachment type not supported"
  • "Invalid file type for attachment"

Exploring the Issue: Unsupported File Types

The root cause of this issue is the inclusion of an attachment with a file type that SparkPost does not support. SparkPost supports a range of common file types, but if your attachment is in a format outside this range, the email will not be sent.

Supported File Types

SparkPost supports the following file types for attachments:

  • PDF
  • JPEG
  • PNG

For a complete list of supported file types, refer to the SparkPost API documentation.

Steps to Resolve the Issue

To resolve the "Attachment Type Not Supported" issue, follow these steps:

Step 1: Identify the File Type

Check the file type of the attachment you are trying to send. Ensure it is one of the supported types listed above.

Step 2: Convert the File

If the file type is unsupported, convert the file to a supported format. For example, you can use tools like Adobe Acrobat to convert documents to PDF or image editing software to convert images to JPEG or PNG.

Step 3: Update Your Code

Ensure your application code correctly specifies the file type in the email payload. Here is a sample code snippet for attaching a PDF file using SparkPost's API:

{
"content": {
"attachments": [
{
"type": "application/pdf",
"name": "document.pdf",
"data": "base64-encoded-content"
}
]
}
}

Conclusion

By ensuring that your attachments are in a supported format, you can avoid the "Attachment Type Not Supported" error in SparkPost. For more detailed guidance, visit the SparkPost Developer Hub.

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