First ensure that the H1B receipt number is yours. Get the receipt notice from Attorney and ensure that your name is there in it. Then for sure you can ignore the email.
The email is just from your Attorney I think, it can be clerical error.
for the second part of question, yes USCIS can reject any case without issuing a RFE. If your online status says its still received, then there is still no update on the case.