How to specify Reply-To using send_raw_email in boto3?

user_870458 0
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Using boto3's send_email I can easily set up custom reply-to addresses with ReplyToAddresses. But how do I achieve the same behaviour with send_raw_email?

Simple send_email example:

import boto3

client = boto3.client('ses')

client.send_email(**{
    'Source': "john@smith.com",
    'Destination': {
        'ToAddresses': ["friend.of.johns@smith.com"],
    },
    'Message': {
        'Subject': {'Data': "Hello!"},
        'Body': {
            'Text': {'Data': "How are you?"},
        },
    },
    'ReplyToAddresses': ['another.john@smith.com']
})

What would this look like with send_raw_email (in particular ReplyToAddresses)?

amazon-ses boto3 python
2 Answers

The send_raw_email API requires you to pass in a complete RFC5322 message as a bytes object. Ad-libbing from your example, something like

from email.message import EmailMessage
import boto3

client = boto3.client('ses')

msg = EmailMessage()
msg['from'] = "john@smith.com"
msg['to'] = "friend.of.johns@smith.com"
msg['subject'] = "Hello!"
msg['reply-to'] = "another.john@smith.com"
msg.set_content("How are you?")

response = client.send_raw_email(
    RawMessage={
        'Data': msg.as_string().encode('us-ascii')
    },
    FromArn='string',
    # ... etc etc
)

The .encode() is required to force the as_string() string into a bytes object. You will want to make sure you only use 7-bit ASCII in the message (for other SES reasons, too), otherwise you will get a UnicodeEncodeError. The Python MIME libraries generally take care of this for you, though you have to use slightly more complex code than the above if you need non-ASCII strings in the email headers.

user_8741880

You can just add it to the Message, something like this one:

{ 'Message' : 'reply-to': {'Data': "email-id"} }

P.S: Follow RFC 5322 to construct the message.

user_84287150
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