Keef:
It's not just BTYahoo which shares Hotmail's trigger happiness. I had a paid for yahoo email account ($20 US/yr.). Too many false positives, to lengthy time in email reception by others, etc.
I canceled the paid for account and now have the free one. With all the annoying adverts that go with that.
I now use Apple's email service via me.com and have had absolutely no problems with that, so far.