can I make google API that send email just from my email

Question

Hi I am trying to make c# application that send email from my email to verity of users I want the program to send email just from my account do I have to make the full process of makeing the api that send email from a deferent users or there is a way to make a connection with just my email

Answer 1

First off if you have a google workspace account. Then you could use a service account with domain wide deligation and delgate to a user on your domain. Then when you run your app it will be like that user is sending the emails. For example create a noreply user on the domain and jsut send emails from them.

string ApplicationName = "Gmail API .NET Quickstart";
            const string serviceAccount = "clawskeyboard-smtp@clawskeyboard-api.iam.gserviceaccount.com";

            var certificate = new X509Certificate2(@"D:\Creds.p12", "notasecret", X509KeyStorageFlags.Exportable);

            var gsuiteUser = "noreply@yourdomain.com";

            var serviceAccountCredentialInitializer = new ServiceAccountCredential.Initializer(serviceAccount)
            {
                User = gsuiteUser,
                Scopes = new[] { GmailService.Scope.Gmail }

            }.FromCertificate(certificate);

If this is a standard gmail account as i suspect then things will be much harder. First off you will need to set up oauth2 and authorize your app as yourself. This can be done easy enough.

 UserCredential credential;
        using (var stream = new FileStream("client_secret.json", FileMode.Open, FileAccess.Read))
        {
            string credPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
            credPath = Path.Combine(credPath, ".credentials/Creds.json");
            credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
            GoogleClientSecrets.FromStream(stream).Secrets, Scopes, "user", CancellationToken.None,
            new FileDataStore(credPath, true)).Result;
        }
        return credential;

Just remember to watch it though if the refresh token ever expires you will need to authorize it again.