We're seeing a few reports in Blogger Help Forum: Something Is Broken about problems with email, sent by Blogger, when the destination is a non GMail email system.
Some email systems verify the sending email address, against IP address. With these systems, email which originates from a Blogger account that's based on a non GMail email address, and comes from a Blogger / Google IP address, is going to present a problem, to the account owners.
If your Blogger account is based on a non GMail email address - and your blog uses comment moderation or notification email - you're going to have email "bounced" by some (non Google) email clients.
Blogger originated email, to certain email clients, will be bounced, because Blogger sends the comment moderation or notification email with your Blogger account mentioned, as the sender.
With Blogger comment moderation / notification email coming from a non GMail based Blogger account, and sent from a Google IP address, an email client such as AOL, HotMail, or Yahoo, which verifies email address against IP address, is going to reject the incoming email message. This is because "Sender Policy Framework", which AOL, HotMail, Yahoo, and other email systems use, detects the originating address as "spoofed".
Spoofing is a common technique used by spammers, in hiding their email identity. Most email based spam is spoofed - so email systems, which use SPF to identify spam, will bounce any messages which do not verify properly - when IP address and originating email address are compared.
The problem may also involve comment subscription email. This may result in bounce messages being sent to the person attempting to publish a comment. This causes more confusion.
The solution, to the problem with moderation / notification email, is simple - but unlikely to satisfy many Blogger account owners. You will have to use a GMail email address, for comment moderation or notification. Until Blogger Engineering figure a better way to send the moderation / notification email, email clients such as AOL, HotMail, and Yahoo will have this problem.
If the blog owner changes ownership of a blog, from a non GMail based Blogger account to a GMail based account, and neglects to change the comment moderation / notification email address, the bounce messages will likely continue. What might happen with comment subscription email is yet to be determined.
The involvement of Google Apps based (non "gmail.com" Google email) Blogger accounts, and Blogger originated email, is yet to be studied. Also please note that Blogger account email addresses, and comment moderation / notification email addresses, do not have to be the same - and this may cause still more confusion.
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