The mail I care about doesn't look like ad copy. It's usually plain-text or at least reads fine when displayed that way. It comes from people I know and/or care

The mail I care about doesn't look like ad copy. It's usually plain-text or at least reads fine when displayed that way. It comes from people I know and/or care about. Attached images don't display by default. Remotely hosted anything doesn't even get requested. Fancier looking spam is just going to be easier to spot.