Optimizely <<product-name>> uses the `System.Net.Mail.SmtpClient` object, provided by the .NET Framework, to send e-mail.

For Insite-hosted solutions, the SMTP settings will be configured for you by Insite. The application will use an external emailing service for all e-mail communication.

For on-premises solutions, these settings must be configured in the **web.config** file in the root directory of the <<product-name>> project.

The following example configures the delivery format, delivery method, and from address for sending e-mails.

For more help configuring SMTP, see the MSDN documentation:

<https://msdn.microsoft.com/en-us/library/ms164240.aspx>

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Cloud note

For <<product-name>> Cloud, the SMTP settings will be configured for you by <<product-name>>. The application will use an external emailing service for all e-mail communication.