Please, how to disable Send to Friend option?

Chinese are using the option to send 1000s of emails to [email protected] and .. 163.com.

Spam Bot Detect plugin was installed on the website though

It even came to a point where when you change the mail settings on oc-admin and save it, when you refresh the page, it automatically changes back to the old email address....

Hello Team,
Please, any solutions?

We have disabled email sending from Osclass, completely deleted the email user account. If we setup mail sending again without a solution, the spam may come back

Spam bot will not access your site. It just send post rewuest to your site.
Enable this feature to logged-in users only.

Please, hiw to enable Send to Friend for login users only then?

Because, even though the item concerned has been blocked, and mail settings have been removed at the back office, they still make the requests to Send to Friend and they are shown in Firewall Log.
Just there are ni more mails going through as mail functionality has been disabled on Osclass

That should be in listing settings

Where exactly is the option to disable or turn it on only for registered users? I couldn't find it.

Or use Cloudflare.

Just add the page: https://www.yoursite.com/item/send-friend/

To Managed Challenge in the WAF security section.

You won't get any more bots sending spam and it's part of the CloudFlare free service :-)