[Alfa1]

In your config.php you have defined the email address where error mails are going to and from where forum mail is being sent. Much of your forum mail will bounce and return to your server. Quickly filling up your mailbox on your server with thousands of emails. This can have an effect on your server's performance and may result in warnings from your host.

It may be worth looking into what the exact problem is. Maybe you can solve it by using a different email address, so email does not get bounced back to your server, but lands somewhere else. If that's the case you would want to look into EZ Bounced Email Management for Admins