Is your mail box protected by Spamhaus?

It's not improbable:

Spamhaus realtime threat and reputation blocklists currently protect over 3 Billion user mailboxes* and are responsible for blocking the vast majority of spam and malware sent out on the Internet. Spamhaus data is today used by the majority of the Internet's ISPs, email service providers, corporations, universities, governments and military networks.

https://www.spamhaus.org/organization/

What is Filtered Away?

The SBL is queriable in realtime by mail systems thoughout the Internet, allowing mail server administrators to identify, tag or block incoming connections from IP addresses which Spamhaus deems to be involved in the sending, hosting or origination of Unsolicited Bulk Email (aka "Spam"). The SBL database is maintained by a dedicated team of investigators and forensics specialists located in 10 countries, working 24 hours a day to list new confirmed spam issues and - just as importantly - to delist resolved issues.

https://www.spamhaus.org/sbl/

Not email adresses, as I imagined, but IP adresses.

So, if you want to block an actual user, here is how you do it, unless he has his own computer.

• find out where he uses the internet
• send out lots and lots of spam from the computers there
• and Spamhaus will do it for you.

All IP adresses I send from are beyond my control. It has it's good side, I cannot get my computer hacked by a virus. Why? Because my computer doesn't exist, I'm always borrowing one. Spamhaus is guaranteeing it also has a bad side, if people can be made to send spam from where I access the internet.

It seems to have happened./HGL

PS, it could have been a question of the IP adress of my email's server, another spam related blocking thing noted 78 complaints 3 months ago, and no newer ones, and it was on gmx.de which is the basis for my "public correspondence" email hgl@dr.com. Same thing there. Now, as just one user of the email, I cannot request an unlisting of this server, since I don't own it.

It could happen to you, even if you had a personnalised email, like ending in your surname plus extension. As long as someone else is handling the contact with mailer daemon, someone else is providing a server for thousands of email adresses, the fact that your email has a personnalised domain won't protect you from getting spamblocked if the blocklist is based on blocking IP adresses, and it targets the IP adress of the email server rather than the domain of the free version (if any) of the same email./HGL