Web E-mail Protection external users receiving wrong URL in expiration e-mail

Products

• Encryption Management Server

Issue/Introduction

Symantec Encryption Management Server (SEMS) Web E-mail Protection (WEP) remote users are receiving the account expiration e-mails that have an internal, non-resolvable, reply URL.
The account expiration e-mails are being sent to the remote users from the internal SEMS server.
That e-mail includes the internal, private, non-resolvable, URL of the internal SEMS server.

Cause

The internal SEMS server has the private URL configured in the Services > Web Email Protection > Interface > Public URL field.

Environment

Symantec Management Server 3.4.x 
Two server cluster.
One server is in the DMZ and the other is in the internal network

Resolution

Modify the Services > Web Email Protection > Interface > Public URL field to include the correct, publicly resolvable, URL