Kind of ironical, isn't it?
Nowadays, GMail is not known for its secrecy or, to be more specific, the way it handles a user's private data. And to have 'The Director of the Top Secret Research Group' use a GMail ID for official correspondence is simply contradictory. Wally has not been following the latest technology news & trends...
Several commenters don't seem to get it. Wally will now just go sign up as TopSecretResearchDirector@gmail.com. In fact, he may have already done that, being prepared in advance for this conversation. Hmm. . . I bet Wally has also registered YourBoss@gmail.com, TheCEO@gmail.com, RulerOfTheUniverse@gmail.com, DilbertCartoonist@gmail.com, and so on. . . Unless Dogbert beat him to it. . .