> Imagine if email services worked this way! “subscriber@otherhost is rumored to be slightly politically oriented in a way we don’t like, so we as admins have p

> Imagine if email services worked this way! “subscriber@otherhost is rumored to be slightly politically oriented in a way we don’t like, so we as admins have prevented everyone@thishost from mailing everyone@otherhost, and vice versa”. This actually does happen. It's not as common as it is with ActivityPub servers, but it exists. Most mail servers do have ways of rejecting or blackholing content from specific addresses or domains. The functionality became necessary for dealing with spam mail. :/