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This article explains what to do if you are receiving duplicate or double Emails as well as why this issue is occurring.

The issue will be resolved in WebCenter v18.


  • Users quickly notice they are often receiving duplicate notifications for the same actions taken in WebCenter
  • Currently use Exchange Server

This issue occurs due to the Max Acknowledgement Delay on Exchange uses. The default value is 30 seconds which takes the Exchange longer time than expected to send an acknowledgment back to WebCenter. Because of this, WebCenter issues a second copy of the notification before it receives the acknowledgment from the Exchange and thus causing duplicate Email notification to be sent to the end user.


To resolve this issue, it has been suggested to install a virtual SMTP server on the Application server to forward these notifications to Exchange.


To configure the IIS SMTP Email server to forward Emails to Exchange, please follow the instructions below:

  1. Open the Server Manager.

  2. Go to Features and select the SMTP Server feature to allow you to set up an Email server.

  3. Add the required Role services:

  4. Complete the installation.
  5. If not started, start the Simple Mail Transfer Protocol service and set it to automatic.

  6. Go to IIS 6.0 Manager > SMTP Virtual Server > Properties.

  7. In the General tab check the Enable logging checkbox.
  8. Click Logging Properties and add the options as indicated below:
  9. In the Access tab, click the Relay… button.
  10. Add the IP address of the application server to the Only the list below list.
  11. Now, click Connection… in the Access tab and add the IP address of the application server to the Only the list below list.

  12. Then go to the Delivery tab and click Outbound Security....

  13. Choose the Basic Authentication radio button and specify your Email account and password. Check the TLS encryption checkbox.

  14. Then go to Outbound connections and set the TCP port to 587.

  15. In the Advanced Delivery options, under Smart host enter the fully-qualified domain name of the Exchange Server.

Article information
Applies to


Last revised 
Case Number00925897, 00723023, 00690126, 00632343