Shamim's Plugins

Add following code in your theme’s (child theme’s if you are using) functions.php

add_action( 'fep_display_after_parent_message', function(){
	if ( get_current_user_id() != fep_get_message_field( 'mgs_author' ) ) {
		printf( '<div>Sender Email: %s</div>', fep_get_userdata( fep_get_message_field( 'mgs_author' ), 'user_email', 'id' ) );
	}
});

By default it does not support export announcements data, But you can access directly to database and export from there. It needs some DB knowledge.

Where you want to show sender’s email address?

You need to echo from there. Like following (change as you require)

add_action( 'fep_form_field_output_date', function( $field, $errors ){
    echo 'This is date field';
}, 10, 2);

You can use like following

add_filter( 'fep_eb_email_legends', function( $legends, $mgs, $user_email ){
    $legends['custom_tag'] = array(
        'description' => __('Description of this custom tag', 'front-end-pm'),
        'where' => array( 'newmessage' ), //where this tag will be used
        'replace_with' => ! empty( $mgs->mgs_id ) ? fep_get_meta( $mgs->mgs_id, 'cus_fep_activity', true ) : ''
    );
    return $legends;
}, 10, 3);

Now add {{custom_tag}} in your email template in Front End PM PRO > Settings > Emails

type date is not defined in this plugin by default. You can use fep_form_field_output_date action hook to output date field.

Can you please go to Dashboard > Front End PM PRO > Settings > Emails > Email Sending Interval and change to any other value and save changes. Wait selected amount of time and check again.
Let me know.

Yes, both possible. Let me know if you want to remove or edit it so that i can instruct you.
If edit, let me know what you want to show.