Tukukkk

If I try to use Boto 3 to send an email with SES with a Reply-To header that doesn't match some other header in the email, using a script like this...

import boto3

client = boto3.client('ses')

client.send_email(

    Destination={

        'ToAddresses': [

            "someone@example.com"

        ],

        'ReplyToAddresses': [

            "someoneelse@example.com"

        ]

    },

    Message={

        'Body': {

            'Text': {

                'Charset': "UTF-8",

                'Data': 'Bla bla bla',

            },

        },

        'Subject': {

            'Charset': "UTF-8",

            'Data': 'Bla bla bla',

        },

    },

    Source="My Company <noreply@example.com>",

)

... then I receive an error like this:

Traceback (most recent call last):

  File "/Users/markamery/test.py", line 24, in <module>

    Source="My Company <noreply@shielddx.com>",

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/botocore/client.py", line 320, in _api_call

    return self._make_api_call(operation_name, kwargs)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/botocore/client.py", line 596, in _make_api_call

    api_params, operation_model, context=request_context)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/botocore/client.py", line 632, in _convert_to_request_dict

    api_params, operation_model)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/botocore/validate.py", line 291, in serialize_to_request

    raise ParamValidationError(report=report.generate_report())

botocore.exceptions.ParamValidationError: Parameter validation failed:

Unknown parameter in Destination: "ReplyToAddresses", must be one of: ToAddresses, CcAddresses, BccAddresses

This doesn't make much sense to me. What I'm trying to do here seems to be a best practice (see https://stackoverflow.com/a/14555043/1709587) and according to https://forums.aws.amazon.com/thread.jspa?threadID=60093&tstart=0, as of 2011, you can use "any email address" in the "Reply-To" header.

What causes this error? Have SES's rules been changed again since that forum post from 2011? Is the error I see above an undocumented restriction for accounts that are in the sandbox, like mine? Or is this a bug - is Boto 3, on the client side, applying stricter validation of ReplyToAddresses than the AWS API itself does?

According to the boto3 docs you need to put the list of reply-to adresses in an argument outside of the Destinations argument. It seems strange to me too.

send_mail(

    ...,

    Destination={...},

    ReplyToAddresses=[

        'someoneelse@example.com',

])