Let's just said that I sent an email creative to multiple thousands of people with my own email address in the welcome message.
Thanks to my coworker, this error has been spoted 3 days later!
And you know what? I only got like replies from people realising that this address wasn't their... No more than that.
So now, when I code an email, I DO NOT write any email address, I simply write @@@@@@@@@ to make it evident some value needs to be place there.
Did you get any feedback on your question?
Have you tried it to see if it improves delivery and spam score/filtering?
I just learned about this techinque and i'm wondering if it worth the time to test it...