The decision, excerpt translated from Swedish:
[The principal reverts the policy from 2002 that allowed faculty and students to retain their e-mail addresses in the kth.se domain even though they no longer had a relationship with KTH.][ . . . ]
[This decision takes force on 2019-10-01.]
[ . . . ] [The affected shall be informed by e-mail about the coming deactivation and be given the opportunity for a limited time to move their e-mail service to a different provider. The aim is for this to be finalized by 2020-03-31.]
[ . . . ]
Full statement, PDF 1.1 MB, Swedish:
intra.kth.se/polopoly_fs/1.916…
Everything rots.