MyGov don't actually send you emails concerning anything in detail. Any email from them would only say that you have go a secure message and that you should log into MyGov and read it. They never give you a link to follow.Always check the sender's e-mail address.
I think that in this case the sender's e-mail address of @davedoesporn might be a hint that it's not genuine....
I've received much more convincing scam myGov e-mails and I immediately check the sender's e-mail address, then go to myGov....via the Internet, NOT via the e-mail...and see if there is actually a genuine message for me. More often than not, there isn't a message, which proves that the e-mail is not genuine.