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Notification of Discontinuation of Old Format Keio IDs and Mailing Lists (March 2025)

April 30, 2024
To: keio.jp Users,
Information Technology Center, Keio University
Notification of Discontinuation of Old Format Keio IDs and Mailing Lists (March 2025)


Keio Single Sign-On System (keio.jp) underwent a system change in November 2014.
While it had been possible to continue using "Old Format Keio IDs" and "Old Format Mailing Lists" acquired before November 2014, as ten years have passed since the change and the majority of users, including students, have transitioned to the new system, we will discontinue them as of March 31, 2025.



[Discontinued Items]

Old Format Keio IDs (e.g.):
keiotaro@**.keio.jp (** represents a2, z7, etc.)
Old Format Mailing Lists (e.g.):
keiotaro@ ml.keio.jp


Details: Discontinuation of "Old Format Keio IDs" and "Old Format Mailing Lists"
Date: March 31, 2025 (Tuesday) 10:00a.m. (Japan Standard Time)
Impact:
  • Old Format Keio IDs -> Not usable as authentication IDs or email addresses
  • Old Format Mailing Lists -> Not usable as mailing list addresses


For those using Old Format Keio IDs and Mailing Lists, we kindly ask you to switch to the new format as soon as possible.

New Format Keio ID (Keio Apps ID) (e.g.):
keiotaro@keio.jp, keiojiro.**@keio.jp (The subdomain such as a2, z7, etc., is not added between "@" and "keio.jp.")

New Format Group (e.g.):
keiotaro-group@keio.jp ("-group" is added immediately before "@")

For information on how to confirm your New Format Keio ID (Keio Apps ID), please refer to the following reference information.


Some actions that users need to take when switching (examples)

If you are already using the New Format Keio ID (Keio Apps ID) and New Format Mailing Lists, the following tasks are unnecessary.

  • Inform people who contact you with Old Format Keio IDs and Old Format Mailing Lists that their contact information has been changed.
  • For external mailing lists with Old Format Keio IDs e-mail addresses, change the registered contents (or ask the mailing list administrator to change them).
  • If the address of the Old Format Keio ID is registered as the ID for an external service or the contact e-mail address for the service, change it.


See Also


Last-Modified: June 10, 2024

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