I had a similar email a few years ago about a tip and excessive pay.
I initially was quite surprised by the email and before I considered replying, the email was flagged up and identified as spam.
More recently similar emails have been sent asking for lessons to start as early as possible.
For me what is most noticeable about these is the terrible use of grammar and spelling mistakes that you see in the email. Mine is not brilliant but there is clear difference my errors and the emails written!