We won't leave your readers behind!
http://myblog.blogspot.com will redirect to your custom domain.
Blogger accomplishes this bit of trickery, using standard Internet protocol - a 301 Redirect, which equates "mydomain.com" to "myblog.blogspot.com". The redirect is setup only after you setup a "CNAME" referral, pointing "mydomain.com" to "ghs.google.com". This means that anybody viewing "myblog.blogspot.com" gets "mydomain.com", published to a Google server and indexed through "ghs.google.com". And anyone viewing "mydomain.com", intentionally, gets it directly from the Google server, as indexed through "ghs.google.com".
Recently, however, hackers and spammers have started to setup their blog "myspammyblog.blogspot.com", publish that to a custom domain, then redirect the custom domain not to "ghs.google.com", but to "DNS.myhackingcampaign.com". The reader viewing "myspammyblog.blogspot.com", now gets "myhackingwebsite.com", indexed by "DNS.myhackingcampaign.com".
Blogger is looking for cases of this deviousness. Unfortunately, right now, they are looking too casually, and are seeing false positives. Legitimate blogs, that are genuinely published to a Google Custom Domain, are showing an alarming notice.
This isn't good for your readers.
This isn't good for your readers either.
Who wants to be warned that they will shortly be viewing an untrusted blog?
This blog is not hosted by Blogger and has not been checked for spam, viruses and other forms of malware.Visions of hacking abound in the minds of the readers seeing this.
If you have an established custom domain, it's likely that everybody looking at your blog is using the custom domain URL, in my above example "martinezumc.org", and nobody sees this alert in any great number. If you just setup your custom domain, though, and are now seeing this, you're probably suffering two problems.
- Your readers are a bit confused, if they use "myblog.blogspot.com".
- The search engine spiders aren't going to index your blog, as either "myblog.blogspot.com", or as "mydomain.com".