Shamim's Plugins

By default wordpress support only one email address. So this plugin design that way.
If you code to add more emails for users then that need custom code to send emails to those email address.

Please go to Front End PM PRO > Settings > Recipient > Admins
and set your admin(s). If more than 1 admin is set then users can select to whom they want to send message.
Read more in https://www.shamimsplugins.com/docs/front-end-pm-pro/getting-started-2/only-admin/

See there is admin notice that “Front End PM PRO needs to database update.”. Click “Proceed”

Let me know if you find any bug.

It is already solved in next version. Next version users will get announcements which is published after they registered.

If you have staging/test website it is recommended you test next version first before using in production site. Please check Front End PM PRO > Settings > Licenses > Bleeding edge Update

Please follow https://www.shamimsplugins.com/support/topic/unable-to-remove-maxlength-and-minlength-requirements/#post-14637

Add following code in your theme’s (child theme’s if any) functions.php (instead of second part of above code)

add_filter( 'fep_form_fields', function( $fields ){
	if( isset( $fields['message_title'] ) ){
		$fields['message_title']['label'] = __( 'Subject/Order number', 'front-end-pm' );
                $fields['message_title']['placeholder'] = __( 'Subject/Order number', 'front-end-pm' );
	}
	return $fields;
});

Add following code in your theme’s (child theme’s if any) functions.php
1.

add_filter( 'fep_main_shortcode_output', function( $out ) {
	if( ! is_user_logged_in() ){
		$out = '<div class="fep-error">' . sprintf( __( 'You must <a href="%s">login</a> to view/send a message.', 'front-end-pm' ), wp_login_url( get_permalink() ) ) . '</div>';
	}
	return $out;
});

2.

add_filter( 'fep_form_fields', function( $fields ){
	if( isset( $fields['message_title'] ) ){
		$fields['message_title']['label'] = __( 'Subject/Order number', 'front-end-pm' );
	}
	return $fields;
});

did you tried deactivating all plugins except this and change theme to default theme?

As before reinstall this plugin and change settings except “Sending Interval.” (only this settings change can affect cron).

Let me know.