Allow Staff to view-only email logs content without the ability to delete

/**

 * Let staff view the WP Mail SMTP Email Log and read sent emails, without being able

 * to delete, resend or export logs.

 * Edition: Pro (email logs are a Pro feature). Change 'edit_others_posts' to the

 * capability your staff role has (edit_others_posts = Editors and above).

 */

// Open the Email Log list and single log pages to staff.

add_filter( 'wp_mail_smtp_admin_area_get_logs_access_capability', function () {

	return 'edit_others_posts';

} );

// Lend the "manage" capability only to the email preview request so staff can read the email.

// Delete, resend, export and re-check stay admin-only, and their buttons stay hidden.

add_filter( 'wp_mail_smtp_pro_emails_logs_logs_get_manage_capability', function ( $capability ) {

	if (

		is_admin() &&

		isset( $_GET['page'], $_GET['mode'] ) &&

		$_GET['page'] === 'wp-mail-smtp-logs' &&

		$_GET['mode'] === 'preview' &&

		current_user_can( 'edit_others_posts' )

	) {

		return 'edit_others_posts';

	}

	return $capability;

} );