"It's rather like owning a domain for email"
And I just got a reminder of why this is a good idea.
A spam on one of my domain mailboxes. Hmmm. Who did I give that one to? Obviously set up in December but I can't find any emails sent to it. Then I had a vague recollection of being asked for an email address in the course of a phone call but neither SWMBO nor I can remember which of us was asked let alone who by. Pity as now I don't know who to hold a grudge against but if whoever it was actually does need to contact us they'll get their email bounced with advice that flogging an email address you need to a spammer isn't good for business.
If they really need to get in touch they'll need to find some other way of doing it. Very apologetically.