SendEmailAsync throws incorrect exception

[lonix1]

Describe the bug

SESv2: SendEmailAsync is supposed to throw MailFromDomainNotVerifiedException for a mail sent from an unverified domain.

However it actually throws a MessageRejectedException:

Amazon.SimpleEmailV2.Model.MessageRejectedException: Email address is not verified. The following identities failed the check in region MY-REGION: Foo Bar <[email protected]>

Since we use the exceptions to determine what failed, our code responds to failure incorrectly. This is obviously a problem.

I hope the other exceptions are working as intended.

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

To work as documented.

Current Behavior

Throws incorrect exception.

Reproduction Steps

Send a mail via SendEmailAsync using an unverified domain.

Possible Solution

No response

Additional Information/Context

No response

AWS .NET SDK and/or Package version used

AWSSDK.SimpleEmailV2 3.7.403.1

Targeted .NET Platform

.NET 8

Operating System and version

linux

[bhoradc]

Hello @lonix1,

Thank you for reporting the issue. I am able to reproduce this scenario using below minimal code sample.

AWSSDK.SimpleEmailV2 - 3.7.403.4

static async Task Main(string[] args)
{
    AmazonSimpleEmailServiceV2Client _sesClient = new AmazonSimpleEmailServiceV2Client();
    var request = new SendEmailRequest
    {
        FromEmailAddress = "[email protected]",
        Destination = new Destination { ToAddresses = new List<string> { "[email protected]" } },
        Content = new EmailContent
        {
            Simple = new Message
            {
                Subject = new Content { Data = "This is Test email" },
                Body = new Body
                {
                    Html = new Content { Data = "This is HTML Content" },
                    Text = new Content { Data = "This is Text Content" }
                }
            }
        },
    };
    try
    {
        var response = await _sesClient.SendEmailAsync(request);
        Console.WriteLine(response.MessageId);
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex);
    }
}

Exception:

Amazon.SimpleEmailV2.Model.MessageRejectedException: Email address is not verified. The following identities failed the check in region US-EAST-1: [email protected]
 ---> Amazon.Runtime.Internal.HttpErrorResponseException: Exception of type 'Amazon.Runtime.Internal.HttpErrorResponseException' was thrown.

I will review it with the team to further investigate the issue.

Regards,
Chaitanya

[ashishdhingra]

Per SESv2 > SendEmail, this service API throws below errors:

AccountSuspendedException
The message can't be sent because the account's ability to send email has been permanently restricted.

HTTP Status Code: 400

BadRequestException
The input you provided is invalid.

HTTP Status Code: 400

LimitExceededException
There are too many instances of the specified resource type.

HTTP Status Code: 400

MailFromDomainNotVerifiedException
The message can't be sent because the sending domain isn't verified.

HTTP Status Code: 400

MessageRejected
The message can't be sent because it contains invalid content.

HTTP Status Code: 400

NotFoundException
The resource you attempted to access doesn't exist.

HTTP Status Code: 404

SendingPausedException
The message can't be sent because the account's ability to send email is currently paused.

HTTP Status Code: 400

TooManyRequestsException
Too many requests have been made to the operation.

HTTP Status Code: 429

SimpleEmailV2 package in AWS .NET SDK is automatically generated from the service API models. Perhaps, we need to open ticket with SES service team to advise further.

Thanks,
Ashish

[ashishdhingra]

Internal ticket with service team: P164679864

[ashishdhingra]

@lonix1 Good morning. Thanks for reporting the issue. Even though I have opened an issue with service team, I would request to verify some information.

Per SendEmail, MailFromDomainNotVerifiedException is thrown when The message can't be sent because the sending domain isn't verified.. Sending domain is email domain of sender, not destination.

In our reproduction code below:

static async Task Main(string[] args)
{
    AmazonSimpleEmailServiceV2Client _sesClient = new AmazonSimpleEmailServiceV2Client();
    var request = new SendEmailRequest
    {
        FromEmailAddress = "[email protected]",
        Destination = new Destination { ToAddresses = new List<string> { "[email protected]" } },
        Content = new EmailContent
        {
            Simple = new Message
            {
                Subject = new Content { Data = "This is Test email" },
                Body = new Body
                {
                    Html = new Content { Data = "This is HTML Content" },
                    Text = new Content { Data = "This is Text Content" }
                }
            }
        },
    };
    try
    {
        var response = await _sesClient.SendEmailAsync(request);
        Console.WriteLine(response.MessageId);
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex);
    }
}

it gave exception:

Amazon.SimpleEmailV2.Model.MessageRejectedException: Email address is not verified. The following identities failed the check in region US-EAST-1: [email protected]
 ---> Amazon.Runtime.Internal.HttpErrorResponseException: Exception of type 'Amazon.Runtime.Internal.HttpErrorResponseException' was thrown.

The SES service is complaining about the destination email address [email protected], not the sender domain.

Please confirm the following:

• Share self-contained reproducible code, if different from what we used to reproduce your scenario.
• Could you please check what happens when you specify valid destination domain and/or email address?
• Do you have the sample use case where your sender domain/email identity in SES is not verified?

Please also check Creating and verifying identities in Amazon SES for domain verification and verifying email identities. It talks about domain verification, may be in your use case, it's not done.

Thanks,
Ashish

[ashishdhingra]

@lonix1 Received below communication from SES service team:

---

This error is supposed to be thrown when the custom MAIL FROM domain on the identity is not verified. Custom MAIL FROM domain verification is different than domain verification: https://docs.aws.amazon.com/ses/latest/dg/mail-from.html

The docs for V1 mentions this: https://docs.aws.amazon.com/sdkfornet/v3/apidocs/items/SimpleEmail/TMailFromDomainNotVerifiedException.html

The response of "Message rejected: Email address not verified" is therefore expected when they are using an unverified identity to send emails. If cx is using account in sandbox mode, both sender and recipient needs to be verified. If they are in production, they need to verify the sender domain/email only.

Thanks,
Ashish

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[lonix1]

Hi @ashishdhingra sorry for the late response,

I think we are misunderstanding each other. I used similar code to yours and got the same result. I understand the difference between sender and receiver.

The issue if I remember correctly is this:

MailFromDomainNotVerifiedException

The message can't be sent because the sending domain isn't verified.

MessageRejectedException

The message can't be sent because it contains invalid content.

But as you and @bhoradc verified in your own code, if you send from an unverified domain, it throws the latter instead of the former.

We've moved on from this issue, but from what I can tell either 1) it is throwing the wrong exception, or 2) the docs must be updated.