Answer
Confirm the documented attachment size limit for the mail mechanism you're using before troubleshooting a "silent" failure — an oversized attachment is a common, quiet cause of an email task appearing to do nothing.
Work through these checks
- Identify the exact mail mechanism and its documented attachment limits for your release. Record file size, encoding, message size, and sanitized error details.
- Send a tiny fictional attachment to an approved test recipient through the same path. Confirm whether the failure occurs while generating the file, adding it, queuing the message, or delivering it.
- Compare the full message size with every applicable limit, including transport limits. Increasing a database string size alone does not increase all limits.
- If the supported path cannot carry the document, use an approved document-delivery approach with recipient authorization. Test access, expiry where applicable, and retries without duplicate messages.