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SparkPost Invalid Custom Header

The custom header in the email is incorrectly formatted.

Understanding SparkPost: The Email Communication API

SparkPost is a leading email delivery service that provides robust APIs for sending and tracking emails. It is widely used by developers and businesses to ensure reliable and efficient email communication. SparkPost's API allows for the customization of email headers, which can be used to add metadata or control email behavior.

Identifying the Symptom: Invalid Custom Header

When using SparkPost, you might encounter an error related to an 'Invalid Custom Header'. This issue typically manifests as a failure to send emails or unexpected behavior in email processing. The error message might not always be explicit, but it generally indicates a problem with the email headers.

Common Error Messages

Some common error messages associated with this issue include:

  • 'Invalid header format.'
  • 'Custom header not recognized.'
  • 'Malformed header detected.'

Exploring the Issue: What Causes Invalid Custom Headers?

The root cause of an invalid custom header is usually an incorrect format. Email headers must adhere to specific standards, and any deviation can lead to errors. Common mistakes include:

  • Using illegal characters in the header name or value.
  • Incorrectly formatted key-value pairs.
  • Exceeding the maximum allowed length for headers.

Understanding Email Header Standards

Email headers must comply with the standards outlined in RFC 5322. This includes using only ASCII characters and ensuring proper syntax.

Steps to Fix the Issue: Correcting Custom Header Format

To resolve the 'Invalid Custom Header' issue, follow these steps:

Step 1: Review Header Syntax

Ensure that your custom headers are correctly formatted. Each header should follow the pattern:

Header-Name: Header-Value

Make sure there are no illegal characters or spaces in the header name.

Step 2: Validate Header Length

Check that your headers do not exceed the maximum length allowed. While there is no strict limit, keeping headers concise is recommended.

Step 3: Use ASCII Characters

Ensure that all characters in the header are ASCII. Non-ASCII characters can cause parsing errors.

Additional Resources

For more information on email header standards and best practices, refer to the following resources:

By following these guidelines, you can ensure that your custom headers are correctly formatted, preventing errors and ensuring smooth email delivery with SparkPost.

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