You can securely send important emails by setting the security level when writing emails.
For the security level, only the levels permitted by the administrator are displayed among 'General', 'Restricted', 'Confidential', and 'Non-business'.
For emails set as 'Restricted' or 'Confidential', they cannot be sent to an external address.When replying or forwarding, the previously set security level, expiration date, and forwarding option values cannot be edited or deleted.
Emails marked as 'Non-business' can be sent for non-business purposes and are excluded from footers and monitoring targets. However, they will be included in the scopes of Audit and Archiving.
If you select 'Restricted' or 'Confidential', you can set the expiration date and the option on prohibiting forwarding.
After the expiration date, the email is automatically deleted from the recipient's mailbox, and may also be deleted from the sender's mailbox depending on the administrator’s settings.
If the forwarding prohibition option is enabled, you cannot forward received emails to others or add new addresses when replying to selected recipients or replying to all.
Security level settings
Mobile
- Tap
in the email you are composing. - Tap 'Security level'. Depending on the content and importance of the email, you can select one of the following security levels: 'general', 'Restricted', 'Confidential', and 'Non-business'
- When you select 'Restricted' or 'Confidential', you can set the expiration date and whether to prohibit forwarding.
- Expiration date: The deadline on which you can check the email. Emails will be automatically deleted after the set period. You can select among None, 1 day, 1 week, 1 month, or 3 months.
- Disable forwarding: Change the setting to make sure received emails cannot be forwarded to others.
- Tap 'Confirm'.
PC Web
- Click
at the top. - Click 'Mail'.
- Click 'Compose' in Mail.
- Select 'Security'. Depending on the content and importance of the email, you can select one of the following security levels: 'General', 'Restricted', 'Confidential', and 'Non-business'.
- When you select 'Restricted' or 'Confidential', you can set the expiration date and whether to prohibit forwarding.
- Expires after: The deadline on which you can check the email. Emails will be automatically deleted after the set period. You can select among None, 1 day, 1 week, 1 month, or 3 months.
- Disable forwarding: Change the setting to make sure received emails cannot be forwarded to others.
Change the security level
You can change the security level of an email.
Mobile
- Tap 'Security level' in the email you are composing.
- Select the level, expiration date, and whether to prohibit forwarding and tap 'Confirm'.
PC Web
- Select the security level in the 'Security' section of the email you are composing.
- Select the expiration date or whether to prohibit forwarding.
Remove the security level
Mobile
In the email you are composing, tap 
of the security level to remove the security level. You can reset the security level after removing it.
PC Web
At the top of an email you are composing, click right to the set security level value.