Ezines check against their own db, and use Google's API, and do a shingle test using Google's own 40 gig db of shingle frequencies. They also have some in-house grammar correctness checks too. As a general rule, don't submit unoriginal stuff to ezines if you care about the account. BTW, you can get ANYTHING (just about) accepted by them if you pay. I have already posted on other threads some hilarious examples of awfully written crap by 'pro authors'. Ezines isn't the quality powerhouse it once was. Ho hum. 'spose they have to make a living too...