The following steps will create an alert enabled search:
1. For any search, in the search properties select the Alert tab
2. Place a check mark in the SMTP option.
3. Enter the email address(s) (or click the ellipsis to find them) for the people who should get the alert.
4. Make any additional changes for the Custom Email alert and then click OK.
5. Check Alert Enabled.
6. Click Save.
If after doing above SMTP alert is not being received, go to View - Administration - Configuration - Coordinator - SMTP, and click on Test Connection. If it fails, there is some network issue or configuration issue at SMTP side. Please ask customer to investigate on this.