This came to my inbox. However, I wouldn’t touch this with a 10’ pole.

     Dear PGP/GPG user,
     My name is Sven Braun and I am an MSc candidate at the Oxford
     Internet Institute, University of Oxford, United Kingdom.
     You receive this message, as your email address is publicly
     available on PGP public key servers.
     I am running a study on the usage of the email and data encryption
     software PGP/GPG to understand who is using PGP/GPG and encryption
     in society.
     I kindly invite you to participate in my
     survey: [1]https://oii.qualtrics.com/SE?Q_DL=2cwWZBfUIKuwBYV_blrVb70
     dci9gK5T_MLRP_cOr20AuySQUMcdv&Q_CHL=email
     If you have any further questions about this research, please do not
     hesitate to contact me <[2]sven.braun@oii.ox.ac.uk> (+44 1865
     986891) or my advisor Dr Anne-Marie Oostveen
     <[3]anne-marie.oostveen@oii.ox.ac.uk> (+44 1865 287208).
     Many thanks in advance for your participation,
     Sven
     --
     Sven Braun
     MSc Candidate, Social Science of the Internet
     Oxford Internet Institute
     University of Oxford

   Mike

References

   1. https://oii.qualtrics.com/SE?Q_DL=2cwWZBfUIKuwBYV_blrVb70dci9gK5T_MLRP_cOr20AuySQUMcdv&Q_CHL=email
   2. mailto:sven.braun@oii.ox.ac.uk
   3. mailto:anne-marie.oostveen@oii.ox.ac.uk