How can I troubleshoot an LMTP 552 error when sending emails with attachments?

By: USER5661
29 Agustus 2025 Support 5 minutes
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Grade: Education Subject: Support
How can I troubleshoot an LMTP 552 error when sending emails with attachments?
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When sending emails with attachments, ensure the `Content-Type` header is correctly set to include the attachment's MIME type (e.g., `multipart/mixed`). Verify the attachment data is properly encoded and appended to the message body. Check for any encoding issues or incorrect boundary delimiters in the `multipart/mixed` structure.
Answered on 29 Agustus 2025

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