Howdy,
You can talk to your basis folks about putting a filter in SCOT so that the emails generated in SOST don't go out.
If you go to SCOT and click on the SMTP node you'll see an Internet checkbox with a SET button.
In the address area you can add a whitelist of email addresses that can receive the emails, and you can use wildcards as well, eg testuser@your-company.com or *your-company.com.
That way the emails will still be generated and you can view them through SOST, but they will red-light and won't be delivered.
Cheers
Alex