Getting "InvalidParameterValue - Missing final '@domain'" from Amazon SES while sending an email with unicode characters in destination address

Question

Amazon SES returns the error mentioned above when i try to send an email that contains unicode characters in the To: field. Amazon SES Documentation says that such email addresses should be sent in MIME encoded-word syntax, which the mail gem (used by ActionMailer) is doing correctly, it is sent as: =?UTF-8?B?dmluYXl2aW5heeKAmXNAbWFpbGluYXRvci5jb20=?=

Answer 1

I was seeing this same error, and found it was due to an incorrect ReturnPath parameter. The error indicates your ReturnPath parameter does not have a domain name. The ReturnPath parameter should be an email address, and it's the address to which bounce notifications are forwarded.

Answer 2

The question is pretty old, but I'll add my case for it seems to be the first result searching for problems with "Missing finale @domain" on AWS SES.

(the only other SO question I found is AWS SES Missing final '@domain' PHP SDK )

As in the other question's answer, InvalidParameterValue is returned every time a parameter don't pass validation.

In my case I was using boto3 on python, composing the Destination parameter with some keys that could be empty, like so:

to = []
bcc = []
# Some code to populate one or both lists..
response = client.send_email(
        Destination={
            'ToAddresses': to,
            'BccAddresses': bcc
        },
        Message={
            'Body': {
                'Html': {
                    'Charset': MAIL_CHARSET,
                    'Data': message,
                },
                'Text': {
                    'Charset': MAIL_CHARSET,
                    'Data': message,
                },
            },
            'Subject': {
                'Charset': MAIL_CHARSET,
                'Data': subject,
            },
        },
        Source=MAIL_SENDER,
    )

If one of the two keys in the dict assigned to the Destination parameter was an empty list the InvalidParameterValue was returned. Solution is to simply remove empty, useless, key:

to = []
bcc = []
# Some code to populate one or both lists..
destinations = {
            'ToAddresses': to,
            'BccAddresses': bcc
        }
response = client.send_email(
        Destination={typ: addresses
                     for typ, addresses in destinations.iteritems()
                     if addresses},
        Message={
            'Body': {
                'Html': {
                    'Charset': MAIL_CHARSET,
                    'Data': message,
                },
                'Text': {
                    'Charset': MAIL_CHARSET,
                    'Data': message,
                },
            },
            'Subject': {
                'Charset': MAIL_CHARSET,
                'Data': subject,
            },
        },
        Source=MAIL_SENDER,
    )