Granting access to the Editor Role?

You can control the access privileges using the flamingo_map_meta_cap filter hook. As Flamingo requires the flamingo_edit_inbound_message and flamingo_edit_inbound_messages capabilities when you access the Inbound Messages screen, and the Editor and higher roles have the edit_pages capability, you can allow Editor users to access the Inbound Messages screen by adding custom code like the following:

add_filter( 'flamingo_map_meta_cap', function( $meta_caps ) {
  $meta_caps = array_merge( $meta_caps, array(
    'flamingo_edit_inbound_message' => 'edit_pages',
    'flamingo_edit_inbound_messages' => 'edit_pages',
  ) );

  return $meta_caps;
} );

Great! Thanks!