It's entirely true that Gmail accepts mail at much higher rates than other major ISPs, and that their default handling of unwanted mail is to place it into the

It's entirely true that Gmail accepts mail at much higher rates than other major ISPs, and that their default handling of unwanted mail is to place it into the spam folder - but the truth is they can and will bounce mail if it's bad enough. It's just extremely uncommon for most people - even email marketers - to ever run into a situation where that happens.