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What Is A Blacklist?

A blacklist or a blocklist is a list of IP addresses that are considered to be distributing spam

A blocklist is used by ISPs(Internet Service Providers) as a filter to block messages that are believed to be malicious. It uses pieces of information and a set of criteria to determine whether an email contains spam or not.

When a blacklisted domain or IP address sends a message, it’ll be automatically sent to the spam folder. Unfortunately, non-spam emails can get on the list too. Therefore,  it’s crucial for marketers to take steps so that their email marketing doesn’t end up on the list.

Some of the indications that your email is on the blacklist:

What causes it?

Many factors determine whether an IP or domain is sending malicious messages. Here are some possibilities:

How to avoid it?

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