Microsoft Graph API - Is it possible to send an email with a "plus identifier"?

Question

Hi,

I'm trying to send an email from another account using an app.

If the email is sent from the account with the original name, it works fine, however, adding a "plus identifier" causes à 'SendAsDeniedError'.

Works: ******@my.host.com
Does not work: ******@my.host.com

Is there a workaround for this?

Java sample code:

    Message someMessage = new Message();
    someMessage.from = new Recipient();
    someMessage.from.emailAddress = new EmailAddress();
    someMessage.from.emailAddress.address = "******@my.host.com"; // Email sent successfully
    someMessage.from.emailAddress.address = "******@my.host.com"; // Causes 'ErrorSendAsDenied'

    someMessage.toRecipients =
        List.of("******@my.host.com").stream()
            .map(
                ea -> {
                  Recipient recipient = new Recipient();
                  recipient.emailAddress = new EmailAddress();
                  recipient.emailAddress.address = ea;
                  return recipient;
                })
            .toList();

    someMessage.body = new ItemBody();
    someMessage.body.content = "Some content";
    graphClient
        .users("******@my.host.com")
        .sendMail(UserSendMailParameterSet.newBuilder().withMessage(someMessage).build())
        .buildRequest()
        .post();

Answer 1

The ‘SendAsDeniedError’ typically occurs when you’re trying to send an email with a sender different from your login address. In your case, you’re trying to send an email from “******@my.host.com” which might not have the necessary permissions.

Here are a few potential workarounds:

1. Check Permissions: Ensure that the account “******@my.host.com” has the necessary ‘Send-As’ permissions.
2. Use a Shared Mailbox: If you’re using Microsoft Power Automate, you could try using the “Send an email from a shared mailbox (Preview)” step instead of the “Send Email (v2)” step.
3. Remove the Plus Identifier: If possible, try sending the email without the plus identifier (i.e., use “@my.host.com” instead of “@my.host.com”).

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".