I am not sure if this is a bug or a design error, but I came across this issue on SE Information Security. I assume that the same code is employed across the various SE sites, so I am posting my question here.
I was trying to edit the question, trackback spotted in multple http errors, when I noticed that I could not submit the edit, due to a URL containing
mydomain.net, which I had not added.
However, the question was obviously asked and entered with this URL in the body text, so was the same URL check not performed when the question was initially submitted? Here is the question containing the erroneous URL