Mail blacklisten

I think you meant to type "mail blacklist".

A blacklist is a list of email addresses or domains that are known to send spam or other unwanted emails. When an email is sent from a blacklisted IP address or domain, it is more likely to be flagged as spam or rejected by email providers.

Here are some common types of blacklists:

1. DNSBL (Domain Name System Blacklist): A DNSBL is a database that maps IP addresses to a list of known spammers. When an email is sent from a blacklisted IP address, the receiving email server can check the IP address against the DNSBL and block the email if it matches.
2. RBL (Real-time Blackhole List): An RBL is a list of IP addresses that are known to send spam. When an email is sent from a blacklisted IP address, the receiving email server can check the IP address against the RBL and block the email if it matches.
3. SURBL (Spam URI Realtime Blocklist): A SURBL is a list of URLs that are known to be associated with spam. When an email contains a URL from a blacklisted domain, the receiving email server can check the URL against the SURBL and block the email if it matches.

Blacklists are used by email providers, ISPs, and organizations to help prevent spam and other unwanted emails from reaching their users.