How to disable welcome message generation in sandbox
Disable the welcome to email before publishing the community:
- Click Settings (Gear) Â on the Top Right of the screen.
- Search for ALL SITES using quick find.
- Click on the Workspace option in front of the  AIA Checkout site.
- Click on the Administration option.
- Go to the Email option and uncheck Send welcome email option and save the changes.
- Click on Builder in front of the AIA Checkout site.
- Click on Publish button on the top right corner of the web page.