Change the from email address from "tool_catalog@ncsa.illinois.edu" to "opensource+tool_catalog@ncsa.illinois.edu", so it's a real one, does not bounce, and can be processed by the ISDA group.

Also, Rob suggested to use Clowder's practice in using Secure Social: change the SMTP host to localhost, so in general for machines without SMTP relay set up, it will not work out of the box.