Not everyone is even contactable from my own domain. The IP address used to belong to some spammers several years ago and some blacklists are still there.

Also, my newsletter, even though it uses double opt-in, triggered some automatic mechanisms of Spamhaus. I ended up on a blacklist several times. Fortunately, I was able to argue my way out and after the last incident, they must have updated their lists.

But those were bad times, no one could literally post a link to my blog onto Twitter etc.