Your friend entered their email address with a trailing period. (dot)
It was 'xxxxxx@yahoo
I have updated it - and removed the dot. I see quite a few mistyped
emails in the database - but it would be a big job to fix them all.
A new enhancement to the site is going to be a confirmation on
registration of users details. With the email address big and bold for
people to confirm.
That should stop this kind of thing happening.
All the game moves your friend is recieving are from challenges. For
some reason, the mail sender didn't care about the extra dot.