IAdmSmtpBasicAuth

[Reflection.Assembly]::LoadWithPartialName("Softerra.Adaxes.Adsi")

# Connect to the Adaxes service.
$ns = New-Object "Softerra.Adaxes.Adsi.AdmNamespace"
$service = $ns.GetServiceDirectly("localhost")

# Bind to the Service Settings container.
$wellknownContainerPath = $service.Backend.GetConfigurationContainerPath("ServiceSettings")
$serviceSettings = $service.OpenObject($wellknownContainerPath, $null, $null, 0)

# Create the credentials object.
$credentials = New-Object "Softerra.Adaxes.Management.AdmSmtpBasicAuth"
$credentials.UserName = "admin@example.com"
$credentials.Password = "Password"

# Update credentials.
$serviceSettings.MailSettings.SmtpAuth = $credentials
$serviceSettings.MailSettings.Save()

using Softerra.Adaxes.Adsi;
using Softerra.Adaxes.Interop.Adsi.Management;
using Softerra.Adaxes.Interop.Adsi.PersistentObjects;
using Softerra.Adaxes.Management;

class Program
{
    private static void Main(string[] args)
    {
        // Connect to the Adaxes service.
        AdmNamespace ns = new AdmNamespace();
        IAdmService service = ns.GetServiceDirectly("localhost);

        // Bind to the Service Settings container.
        string wellknownContainerPath = service.Backend.GetConfigurationContainerPath(
            "ServiceSettings");
        IAdmServiceSettings serviceSettings = (IAdmServiceSettings)service.OpenObject(
            wellknownContainerPath, null, null, 0);

        // Create the credentials object.
        IAdmSmtpBasicAuth credentials = new AdmSmtpBasicAuth();
        credentials.UserName = "admin@example.com";
        credentials.Password = "Password";

        // Update credentials.
        serviceSettings.MailSettings.SmtpAuth = credentials;
        serviceSettings.MailSettings.Save();
    }
}