How to Perform an IPv6 Reputation Check

IPv6 reputation check is the revised version of the Internet Protocol (IP) that uses 128-bit addresses instead of the 32-bit address of its predecessor, IPv4. It has many benefits, including providing more flexibility and security. However, the transition to IPv6 isn’t without its challenges. One of these challenges is the need to properly check reputation of IPv6 addresses, which can have a significant impact on email deliverability.

IP Reputation Checking

When an email sender’s IP is associated with bulk spam, malware, dangerous domains, or suspicious locations, it can quickly have its reputation tanked. A tanked reputation can lead to emails being flagged as spam and blocked from delivery altogether. A quick response to a declining reputation can mitigate the damage and help get your email delivery back on track.

Reputation checks are done by cybersecurity companies and organizations that collect data on malicious activity, including reports from recipients of suspicious emails, and then use it to evaluate the reputation of an IP address. This data is then stored in databases that can be queried for actionable insights, such as to block bad IPs or to tune security controls to reduce risks.

Some of these databases include the MultiRBL, which has over 200 mail server blacklists for evaluating an IP’s reputation, and ABuseIPDB, which is a community-sourced database that provides an overall risk score. Other tools, such as SPF and DKIM, are also used to tie emails to domains. Using these technologies will ensure that an email’s reputation is determined by its domain, rather than its underlying IP address, and therefore more likely to improve email deliverability.

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