Send email from mailbox using .NET GraphServiceClient

Question

Scenario: Console application needs to send an email from defined mailbox. All setup in Azure is done and application has access and all works well in Postman.

Question is how to do the same with Microsoft libraries - especially with GraphServiceClient.

Note: example is not showing message body as it is not relevant for the question.

Raw request

POST https://graph.microsoft.com/v1.0/users/<email-address>/sendMail

.NET code

IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder
    .Create(clientId)
    .WithAuthority(AzureCloudInstance.AzurePublic, tenantId)
    .WithClientSecret(secret) 
    .Build();

ClientCredentialProvider authProvider = new ClientCredentialProvider(confidentialClientApplication);
GraphServiceClient graphClient = new GraphServiceClient(authProvider);

await graphClient.Me
    .SendMail(message, saveToSentItems)
    .Request()
    .PostAsync();

Ryan.Bartsch · Accepted Answer · 2020-05-13 11:25:57Z

1

I've done this in c#.NET - here's some code, which has been refactored/simplified on the fly (so no guarantees) to just show what you need. Obviously you'll need to replace the magic strings with your own values.

var graphServiceClient = new GraphServiceClient(new DelegateAuthenticationProvider(async request =>
{
    var authContext = new AuthenticationContext("https://login.microsoftonline.com/GUID");
    var credential = new ClientCredential("GUID", "P@55w0rd");
    var authResult = await authContext.AcquireTokenAsync("https://graph.microsoft.com/", credential);

    request.Headers.Authorization = new AuthenticationHeaderValue("bearer", authResult.AccessToken);
}));

var user = graphServiceClient.Users["[email protected]"];
var message = GetMailMessage(); // not relevant to question
await user.SendMail(message).Request().PostAsync(new CancellationTokenSource(new TimeSpan(0, 0, 30)).Token);

answered May 13, 2020 at 11:25

Ryan.Bartsch

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1 Comment

Pavel Sem Over a year ago

Key for me was to realize that the graphServiceClient.Users[email] gives me the same options as graphServiceClient.Me

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