um-default-settings.php

<?php

add_filter( 'um_default_settings_values', 'change_um_defaults', 10, 1 );
function change_um_defaults( $settings ) {

    // Set default emaiil sender here
     $settings = array (
        'mail_from_addr' => '[email protected]',
        'mail_from' => 'Digital Church Platform',
    ); 


    return $settings;
}