Does Gmail API (for business) not send email from Alias?

Question

I want to email my clients using different "roles" (e.g. info @, customer support @, technical support @, no-reply @).

I tried 2 approaches:

• Several "users" / accounts in my Gmail for business application.
• A single gmail account with several aliases.

I started by creating a global delegation service account for my Gmail for business application.

To verify that this works, I created 2 users: [e-mail] and [e-mail]. Indeed, I can successfully send emails from both lev @ and root @.

However, when I tried to add 5 separate user accounts for my application, Gmail got a paranoid bot / abuse and asked me to prove that all accounts are “people”, including setting passwords, authorization and checking SMS text via Phone. Moreover, they require different phones for different accounts in order to prove this to another person. Thus, setting up accounts becomes a serious problem.

I also want to avoid creating multiple accounts, because I pay for each, and because semantically all roles are just one account. So aliases seem like a better idea.

, "from" (, from: [e-mail]), :

Exception in thread "main" com.google.api.client.googleapis.json.GoogleJsonResponseException: 403 Forbidden
{
  "code" : 403,
  "errors" : [ {
    "domain" : "global",
    "message" : "Delegation denied for [e-mail]",
    "reason" : "forbidden"
  } ],
  "message" : "Delegation denied for [e-mail]"
}

- ?

/ :

/*
 * Set up a hashmap HashMap<String, Gmail> gmailServiceByAccount where
 * gmailServiceByAccount.get(emailAccount) contains an authorized Gmail service
 */
private void prepareService(String emailAccount) throws Exception {
    if (gmailServiceByAccount.containsKey(emailAccount)) {
        return;
    }
    HttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();
    JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();

    GoogleCredential credential = new GoogleCredential.Builder()
    .setTransport(httpTransport)
    .setJsonFactory(jsonFactory)
    .setServiceAccountId(Config.getInstance().getProperty(Config.gmail_service_account))
    .setServiceAccountPrivateKeyFromP12File(new File(Config.getInstance().getPathToGmailCredential()))
    .setServiceAccountScopes(Arrays.asList(GmailScopes.GMAIL_COMPOSE))
    .setServiceAccountUser(emailAccount)
    .build();        


    gmailServiceByAccount.put(
        emailAccount,
        new Gmail.Builder(httpTransport, jsonFactory, credential)
            .setApplicationName(Config.getInstance().getProperty(Config.google_client_api_application_name))
            .build());
}

, , :

/**
 * Send an email using the parameters provided.
 *
 * @param fromPersonalName : the free text description of the "from" address (e.g. "Customer Suppport" or "No Reply").
 * @param fromAddress : the email address of the sender, the mailbox account (e.g. [e-mail]).
 * @param to : the email address of the recepient.
 * @param subject : Subject of the email.
 * @param htmlContent : (may be null) The HTML-styled body text of the email.
 * @param plainTextContent : (may be null)  The plain text body of the email (e.g if the customer email client does not support or disables html email).
 */
public void sendMail(String fromPersonalName, String fromAddress, String to, String subject, String htmlContent, String plainTextContent) 
        throws Exception {
    prepareService(fromAddress);
    Properties props = new Properties();
    Session session = Session.getDefaultInstance(props, null);

    MimeMessage email = new MimeMessage(session);
    InternetAddress tAddress = new InternetAddress(to);
    InternetAddress fAddress = new InternetAddress(fromAddress);
    fAddress.setPersonal(fromPersonalName);
    email.setFrom(fAddress);
    email.addRecipient(javax.mail.Message.RecipientType.TO, tAddress);
    email.setSubject(subject);

    Multipart multiPart = new MimeMultipart("alternative");
    if (!StringValidation.isEmpty(plainTextContent)) {
        MimeBodyPart textPart = new MimeBodyPart();
        textPart.setContent(plainTextContent, "text/plain");
        textPart.setHeader("Content-Type", "text/plain; charset=\"UTF-8\"");
        multiPart.addBodyPart(textPart); 
    }

    if (!StringValidation.isEmpty(htmlContent)) {
        MimeBodyPart htmlPart = new MimeBodyPart();
        htmlPart.setContent(htmlContent, "text/html; charset=\"UTF-8\"");
        multiPart.addBodyPart(htmlPart);
    }        
    email.setContent(multiPart);


    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    email.writeTo(bytes);
    String encodedEmail = Base64.encodeBase64URLSafeString(bytes.toByteArray());
    Message message = new Message();
    message.setRaw(encodedEmail);
    gmailServiceByAccount.get(fromAddress).users().messages().send(fromAddress, message).execute();

}

Answer 1

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Answer 2

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