To understand whether or not your IP is blacklisted it is recommended to run an IP blacklist check or use GlockApps IP Uptime Monitoring. If the IP address from which the email was sent is on an IP blacklist that a mailbox provider uses, the mailbox provider might filter the email as spam, bounce the email, or drop it entirely. To determine whether or not an incoming email is spam, mailbox providers look at various characteristics of the email including the IP address the email is sent from. Mailbox providers tend to protect their users from spam and choose which of the blacklists they use. Evidence-based listings are those where the server has received direct (or indirect) evidence that the sending IP address has been involved in sending unsolicited emails.Policy listings happen because the receiving server does not wish to receive emails from certain countries, or ISPs, that have a history of not handling “unsubscribe” requests.Technical listings occur mostly because of mail server configuration issues (missing or incorrect reverse DNS records, missing or incorrect banner greetings, and mail servers operating within a suspicious range of IP addresses).Those criteria can include a variety of factors: technical, policy, and evidence-based. Mailbox providers may use services of an external blacklist, and to delist, one would need to contact a third party, rather than a mailbox provider, who uses this blacklist.Įach blacklist uses its own criteria for listing the IP addresses of email spammers. For example, an IP could get on a Gmail’s or Yahoo’s blacklist.Įxternal is a blacklist owned by a third party. Internal is usually a blacklist owned by a mailbox provider. There are two types of blacklists: internal and external. Simply put, a blacklist is a list of IP addresses that have been involved in malicious activity, such as sending spam, emails that contain viruses, etc.
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