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Automation Server > Automation Server configuration and administration guide > Initial project configuration > Best practices in the production environment > Configuring the SMTP service through IIS
![Automation Server > Automation Server configuration and administration guide > Initial project configuration > Best practices in the production environment > Configuring the SMTP service through IIS Automation Server > Automation Server configuration and administration guide > Initial project configuration > Best practices in the production environment > Configuring the SMTP service through IIS](https://help.bizagi.com/bpm-suite/en/smtpmsgsize.png)
Automation Server > Automation Server configuration and administration guide > Initial project configuration > Best practices in the production environment > Configuring the SMTP service through IIS
![Exchange/SMTP connection was unexpectedly closed or error message "454.5.7.3 Client does not have permission to submit mail to this server." Exchange/SMTP connection was unexpectedly closed or error message "454.5.7.3 Client does not have permission to submit mail to this server."](https://www.servolutions.com/images/e2k3-11.png)
Exchange/SMTP connection was unexpectedly closed or error message "454.5.7.3 Client does not have permission to submit mail to this server."
![Automation Server > Automation Server configuration and administration guide > Initial project configuration > Best practices in the production environment > Configuring the SMTP service through IIS Automation Server > Automation Server configuration and administration guide > Initial project configuration > Best practices in the production environment > Configuring the SMTP service through IIS](https://help.bizagi.com/bpm-suite/en/smtpserver2008-3.jpg)