Issue Summary

You’re attempting to use DropMail to import files via email, but no files are being received or processed by PaperOffice.

Root Causes & Explanations

• No attachments present: DropMail only processes file attachments, not email content or inline media.
• Unrecognized or unauthorized sender: Sender email must be verified. Emails from unknown or misconfigured domains may be rejected.
• Blacklisted sender: Sender's domain or IP address may be flagged in spam or security blacklists.
• Invalid MIME or encoding: Emails must follow RFC standards with correctly encoded MIME parts.

Advanced Troubleshooting Steps

1. Confirm PaperOffice Services Are Running: Ensure that all PaperOffice services are active and not blocked by firewalls or antivirus software.
2. Validate Email Attachment: Ensure the email includes at least one file attachment. Inline images or embedded items will not be processed.
3. Verify Sender Domain Configuration: Sender's domain must have valid SPF, DKIM, and DMARC records. SSL/TLS certificates must be properly configured.
4. Check Sender Reputation: Use mail-tester.com to evaluate the sender address. Aim for a score of 10/10.
5. Test with Alternate Email Accounts: Try sending from a different provider to rule out sender-specific issues.
6. Validate Email Format: Ensure email subject and body use UTF-8 encoding and are properly formatted.
7. Review Blacklist Status: Check if the sender’s domain or IP is listed in public blacklists like:
   • Spamhaus
   • MXToolbox

Security Notes

DropMail applies advanced security protocols including:

• SPF, DKIM, and DMARC domain verification
• SSL/TLS certificate checks
• MIME-type validation
• Anti-spam and spoofing heuristics
• Attachment fingerprinting (Enterprise tier)

Example Mail-Tester result