Policy

Disable 'Remember password' for Internet e-mail accounts

Use this option to hide your user's ability to cache passwords locally in the computer's registry. When configured, this policy will hide the 'Remember Password' checkbox and not allow users to have Outlook remember their password. Note that POP3, IMAP, and HTTP e-mail accounts are all considered Internet e-mail accounts in Outlook. E-mail account options are listed on the Server Type dialog box when users choose 'New' under Tools | Account Settings.

Policy
Pack Microsoft Office
Category Microsoft Outlook 2016 / Security
Policy ID 52f2e455e166
Internal name L_DisableRememberPasswordcheckboxforInternetEmailsettingsdialo

Registry

Copy registry mappings

HKCU\software\policies\microsoft\office\16.0\outlook\security\enablerememberpwd (enabled) = 0
HKCU\software\policies\microsoft\office\16.0\outlook\security\enablerememberpwd (disabled) = 1

Policy notes

Use this option to hide your user's ability to cache passwords locally in the computer's registry. When configured, this policy will hide the 'Remember Password' checkbox and not allow users to have Outlook remember their password. Note that POP3, IMAP, and HTTP e-mail accounts are all considered Internet e-mail accounts in Outlook. E-mail account options are listed on the Server Type dialog box when users choose 'New' under Tools | Account Settings.

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Allow Active X One Off FormsConfigure Add-In Trust LevelDo not automatically sign repliesPrevent users from customizing attachment security settingsPrompt user to choose security settings if default settings failTurn off contact exportUse Protected View for attachments received from internal senders