From time to time Newsround Blog has published emails sent to various individuals, mainly people who work at the BBC. However, following my investigation of whistleblowing procedures, I received an email from the BBC on Friday 14th August 2015 which stated "a human error was made in our email system which caused your emails sent to a wide variety of other addresses around the BBC to be diverted for a number of months and not delivered to their recipients."
I've been told that the mistake has now been corrected.
In fact Newsround Blog had not received replies from anyone at the BBC since late November 2014. I did try to check with some of the intended recipients via other means, for example, via Twitter. The BBC's clarification would account for the lack of a responses to emails mentioned in this blog over the last few months.