SYMPTOM
In Narrowcast, emails can be saved to a local folder but not a network folder. When trying to save an email to a network folder, the following error is noticed in the DELog.
Error Message:
Cannot save to path "\\?\UNC\MachineName\Test\Wholesaler Sales by State for period ending 5142014-347CE6C2-E79D-4BB7-AC61-B3ADF40132AB.eml". Last error was: 0:5108:


The following Strategy Knowledge Base technical note provides instructions on the configuration needed to save emails to a shared network location.
KB18503 - How to setup a Strategy Narrowcast Server 9.x cluster to deliver saved emails from all clustered Execution Engines to a shared network location
CAUSE
The Strategy Simple Mail Transfer Protocol (SMTP) Service is running under the localhost account as shown below which does not have appropriate read/write permission to the shared network location.

ACTION
Change the account running the Strategy SMTP Service to the same account running the Strategy Distribution Manager and Execution Engine. For more information on the Strategy SMTP Service refer to the following Strategy Knowledge Base technical note.
TN7739 - What is the Strategy SMTP Service and how is it different from Microsoft SMTP Service?