We've been discussing the problem of email filtering , and missing email, for some time. Some blog members / owners are certain that their missing email isn't caused by filters. I looked in "Bulk" / "Spam"! The email isn't there, either - it simply does not get delivered!! These people are certain that Blogger just is not sending the email. In some cases, the problem is not with "Bulk" / "Spam" filters - it is with anti-spoofing filters - and email detected as spoofed, generally, is "bounced".
What Blogger won't tell you