You will get a university account, which comes with an @sorbonne-universite.fr e-mail address. You got the login data already before I signed the contract via e-mail (subject: identifiant+mot de passe annuaire upmc), but I couldn‘t use it for the e-mail account until I signed the contract. Once your e-mail address works, you can sign in here:

cs.sorbonne-universite.fr/mail

(2019) Ask the ‘référent annuaire’ (Malika) to add you to the UPMC/SU annuaire and provide you with a password)

After you get your SU email address, you will be added to the LJP mailing list. This list is used for lab-wide communication and general announcements, such as for the weekly seminar.