KB78618381: How to Configure IIS SMTP Server to forward emails using a Gmail account

Description

Gmail is used by many companies as SMTP to send mails. However WebCenter does not support Gmail as SMTP. In order to keep using Gmail as SMTP, the IIS SMTP server can be used to forward emails using an Gmail account.

This only applies for WebCenter before version 18.1

Since WebCenter 18.1 we support TLS 1.2 to connect to the SMTP server, and with that also Gmail.

Procedure

In order to configure the IIS SMTP server to forward emails using a Gmail account, please follow the instructions below:

Open the Server Manager.
Go to Features and select the SMTP Server feature to allow you to set up an E-mail server.
Add the required role services.
Complete the installation.
If not started, start the Simple Mail Transfer Protocol service and set it to automatic.
Go to IIS 6.0 Manager > SMTP Virtual Server > Properties.
In the General tab check the Enable logging checkbox.
Click Logging Properties and add the options as indicated below:
In the Access tab, click the Relay… button.
Add the IP address of the application server to the Only the list below list.
Now, click Connection… in the Access tab and add the IP address of the application server to the Only the list below list.
Then go to the Delivery tab and click Outbound Security....
Choose the Basic Authentication radio button and specify your Gmail account and password. Check the TLS encryption checkbox.
Then go to Outbound connections and set the TCP port to 587.
In the Advanced Delivery options, specify the Smart host as smtp.gmail.com.
Finally you must configure the SMTP in the WebCenter Email notifications, using your IIS IP adress or hostname as the SMTP server (if installed on the application server 'localhost' will do), port 25 (which is default for IIS SMTP) WITHOUT authentication.
You may have to enable POP/IMAP in Gmail->Settings->Forwarding and POP/IMAP.