The reputation of an IP address reputation checker is built based on its behavior and how it is used on the Internet. An IP address that behaves well and is not involved in spamming or other malicious activity will build a good reputation. However, if an IP address is associated with spamming or malware and is used by botnets or other malicious actors to carry out attacks, it will develop a bad reputation. In addition, an IP address that is associated with viruses or compromised systems will also earn a negative reputation.

In order to monitor an IP address’s reputation, there are several tools available. One of the most popular is Google Postmaster Tools, which provides information about how Gmail views your email program, including the sender score and a list of domains that are sending spam or causing issues. Another tool is Microsoft SNDS, which helps email marketers monitor their deliverability to Outlook users. Both tools are free and can provide valuable information to email marketers.

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There are also many paid reputation monitoring services that offer APIs or other integrations that allow for automation. Combined with internal logging of bounce codes and feedback loop (FBL) data, these tools can provide developers with alerts via Slack or PagerDuty when thresholds are breached. By using these tools, email marketers can ensure that they are leveraging best practices and keeping their IP addresses clean in order to reach the inboxes of their subscribers.