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Virbl blacklist

Overview

The Virbl blacklist lists IPs that send emails with viruses to their sources. Their primary source is BIT in the Netherlands along with other mailbox providers and hosting providers. Seven other organizations in the Netherlands are also major contributors.

  • Virbl listings occur at the IP address and IP address range level.
  • Its impact on spammers’ deliverability is high. Legitimate senders are only listed if their mail servers are compromised and sending a virus. For legitimate senders, deliverability impact is low.
  • This blacklist is used in the Netherlands.

Reasons for getting listed

The Virbl system remembers the IP addresses that send two virus emails to one of their sources for seven days for reference purposes.

  • Virbl lists an IP address after it has sent two emails containing a virus to one of their spam traps.
  • Forwarded messages and misdirected bounces that contain viruses sent to one of their spam traps.

How to get off this blacklist

First, you need to check the listing status for your IP address on the Virbl website. Your IP address is automatically delisted when Virbl does not detect a virus from your IP address for 24 hours.

If you are unsure of the reason for the listing, email virbl@bit.nl to request headers. If you believe you were listed in error, email the same address as above and provide them with the cause of the listing and and the reasons you think it was listed in error.

Tips for staying off this list

  • Use opt-in or confirmed opt-in permission methods for new subscribers
  • Practice good list hygiene and suppression to avoid spam traps
  • Scan all inbound and outbound email messages for viruses
  • Avoid sending full body bounces; include only the sender, recipient, and error in a bounce
  • Follow all Request for Comments (RFCs) standards for bounce processing
  • Check your servers for open relays and open proxies

 

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