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Is there any limitations to the data size in KUMail?

The storage capacity of the faculty/staff groupware (Google Workspace)
(KUMail<Gmail> Inbox and Google Drive)

The storage capacity of the faculty/staff groupware (Google Workspace) changed as follows.

From March 25, 2024, onward: 100GB limit for each user

For more information

Maximum size of an incoming message

Up to 50MB per one message.

Maximum size of an outgoing message

You can send up to 25 MB in attachments. If you have more than one attachment, they can't add up to more than 25 MB.

If your file is greater than 25 MB, Gmail automatically adds a Google Drive link in the email instead of including it as an attachment. Learn more about Google Drive attachment sharing settings.

(Cited from Send attachments with your Gmail message on Gmail Help)

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Upload limit for KUMail storage

KUMail storage is an online storage for temporarily uploading data to share with users on and off campus instead of attaching files when sending emails.

The available capacity is 2 GB per user. However, it depends on the software used for uploading.

Proself FAQ 「ファイルアップロード時の容量制限について教えてください。」