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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.
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.
Some common error messages associated with this issue include:
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:
Email headers must comply with the standards outlined in RFC 5322. This includes using only ASCII characters and ensuring proper syntax.
To resolve the 'Invalid Custom Header' issue, follow these steps:
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.
Check that your headers do not exceed the maximum length allowed. While there is no strict limit, keeping headers concise is recommended.
Ensure that all characters in the header are ASCII. Non-ASCII characters can cause parsing errors.
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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