> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/boomerang-3-domain-administrator-manual/admin/settings/settings__system_group_settings.md).

# System Group Settings

1. Define system group settings.

<figure><img src="/files/XCPpIQd1izzLbfyWXpEs" alt=""><figcaption></figcaption></figure>

<table><thead><tr><th width="289.5">System Group setting</th><th>Description</th></tr></thead><tbody><tr><td>US SenderID</td><td></td></tr><tr><td>Enable username</td><td>If selected, the users belonging to this system group can log-in using a username instead of the e-mail address.</td></tr><tr><td>Prefill username and password</td><td>If selected, the user credentials in sign-in form are filled in automatically.</td></tr><tr><td>Revise Password periodically</td><td>If selected, users must revise their password periodically.</td></tr><tr><td>Valid period in months</td><td>The period in months for which the password is valid. After this period, it must be revised.</td></tr><tr><td>Block the user account after 3 incorrect login attempts</td><td>If selected, the user account will be blocked after three incorrect login attempts. The blocked account can be unlocked by an administrator.</td></tr><tr><td>E-mail Prefix</td><td>A prefix common for all the system e-mails.</td></tr><tr><td>SMS Prefix</td><td>A prefix common for all the system SMS messages.</td></tr><tr><td>Must comment</td><td>If selected, a comment must be entered for every signing.</td></tr><tr><td>Use PIN for signing</td><td>Users in the group will use PIN for signing instead of password. It is necessary if users that log-in using MS Entra (AD) are present in the group as described in <a data-mention href="/pages/hl2w9ugQVRn0Clds3cri">/pages/hl2w9ugQVRn0Clds3cri</a>.</td></tr><tr><td>Use Two Factor Authentication</td><td>If selected, two factor authentication must be used for login. A user will receive OTP code via email or SMS.</td></tr><tr><td>System group full-size and minimized logo</td><td>Graphics used for system logo on the web and in the reports.</td></tr><tr><td>Fields for test e-mail and SMS</td><td>Fields to enter e-mail address or mobile number to send test messages. Please note that mobile number must contain +country code in the beginning.</td></tr></tbody></table>

2. Click “Save” and sign to store the settings.


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