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  1. Hornetsecurity KnowledgeBase
  2. Spam and Malware Protection

Spam and Malware Protection

Quick Guides

  • Reporting False Positives and False Negatives
  • How to suspend (pause) email delivery
  • Untitled
  • Setting up the Outlook Add-In
  • Using RegExp and collective terms
  • Configuring LDAPs with Azure Active Directory
See all 17 articles

FAQ

  • What does the error "This action is not allowed for this email type" mean?
  • What is behind the Infomail filter?
  • Why are Hornetsecurity IP addresses listed by UCEPROTECT?
  • Why does my email contain a Winmail.dat?
  • Why are Hornetsecurity IP addresses listed at Backscatterer?
  • When will another delivery attempt be made if my mail server is not available?
See all 9 articles

Troubleshooting

  • Why an email has been blocked or quarantined?
  • Understanding message headers
  • Why are emails marked as spam despite being on the Allow List?
  • Why are outgoing emails with the error code 554 5.7.1 rejected?
  • Quarantine report has not been delivered
  • I am waiting for an email that had been sent to me, but I didn’t receive it yet. Was it blocked?
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