Yes, there are some email address prefixes or generic account types that cannot be sent to. These would include:
There are also other variations of these address prefixes in different languages.
The reason why we do not mail to some generic email accounts is because these accounts are often monitored by more than one person. If a person checking that account receives an email they do not recognize, then they would likely report it as spam. If that occurs, it would have a negative affect on our reputation and prevent other emails we are sending from being successfully delivered.