Procedure

1. Verify and ensure the correctness of the administrator's SMTP notification settings. IM Security uses the notification settings to send email notification.
2. Contact your mail administrator to verify whether SMTP server authentication is enabled. If so, verify that the credentials used are valid.
3. Ping the SMTP server to ensure that the server can be resolved (through host name or IP address).
4. Verify IM Security's SMTP port setting is matching the SMTP port being used (the default SMTP port is 25).