Who still uses Yahoo, AOL, Live mail? If someone inquires about my listing (and I use Craigslist a lot) and emails me from Hotmail without sounding suspicious, damn right I'm going to respond.
I still use Yahoo. Why shouldn't I?
What are you using?
Please explain to me what your point actually is - I must have missed it.
That someone could use a less popular email program and still be noticed on Craigslist. Not an automatic generalization that it's spam strictly because of the domain.