i received the same e-mail. i immediatly forwarded it to
support@pokerstars.com
the response came back that it was an error, but is real.
below is their reply with my name delated.
Hello XXXXXX,
Thank you for your email.
I can confirm, that this email indeed was sent from PokerStars to you, if
you would like to take part of it.
We do apologize for the technical error that occurred, when sending the
emails which resulted in wrong User IDs.
Please let us know if you need any further assistance.
Regards,
Bernadett
PokerStars Support Team