Emails between two internal users (email@example.com and firstname.lastname@example.org) do not work. The same email notifications work when either the sender or receiver email address is from another company (i.e. email@example.com).
This is caused by security in the users email system that rejects the email because the email address is internal but comes from an external IP address.
Hosting has an email notification resolution that can be applied to the customer's system that will allow this to work.
Hosted or On Demand Administrators must execute the following updates:
The following 2 attributes should be set:
No need to change any other attributes in the "mailServer" node.
Also note, the attribute 'alwaysUseDefaultEmailFrom' is not shown in CSA, so the 'properties.xml' file must be modified manually.
<mailServer host="XXXX" username="XXX" password="XXX" fromAddress=""
Then restart all services after the properties.xml change is made.