Outbound mail fails to be processed by Encryption Management Server if the email message is sent from an email address that has no display name included with it.
For example, this email address includes the display name First Last:
First Last <[email protected]>
This email address includes no name:
The following error appears in Mail log on the Reporting / Logs page of the Encryption Management Server administration console:
error handling SMTP DATA event: duplicate UserID
There are multiple Internal Users with a value of No display name in their Name column.
Symantec Encryption Management Server 3.4.2 MP3 or Symantec Gateway Email Encryption 3.4.2 MP3 with Directory Synchronization disabled.
Upgrade to Encryption Management Server 3.4.2 MP4 or above.
To workaround this issue in Encryption Management Server 3.4.2 MP3, you will need to create a Display Name for each user that does not have one. From the Encryption Management Server administration console:
After this, please ensure that outbound email messages sent through Encryption Management Server 3.4.2 MP3 are sent from email addresses that include a name. For example: First Last <[email protected]>.