Hi,
No, I didn't quite make the second paragraph clear enough, apologies .. I signed up to the roundcube website, using that address (these forums, I guess). I host all my own stuff, so I am my own "hosting provider". As a further e.g. If i signed up to something on the microsoft website, i'd use "microsoft@mydomain.tld"... Hopefully that makes it a bit clearer.
It just gives me an easier way to differentiate where email is coming from, and in this case, where spam is hitting, and setup MTA rules accordingly.
If anyone else gets spam emails from "Fun Girl", with a picture of some chick on a bed .. then it'll be the compromise with these roundcube forums.
Cheers.