Expected Behaviour

SesModel should populate mail.commonHeaders.reply_to from the replyTo field that SES sends in commonHeaders (see the SES receiving notification contents).

Current Behaviour

reply_to is always None, because the parser model declares the alias as reply-to:

reply_to: List[str] | None = Field(None, alias="reply-to")

The SES data class (SESMailCommonHeaders.reply_to) already reads replyTo, so the two utilities disagree for the same event.

Code snippet

from aws_lambda_powertools.utilities.parser import parse
from aws_lambda_powertools.utilities.parser.models import SesModel

# an SES event whose mail.commonHeaders contains "replyTo": ["reply@example.com"]
model = parse(event=event, model=SesModel)
print(model.Records[0].ses.mail.commonHeaders.reply_to)  # None

Possible Solution

Change the alias to replyTo. Happy to send a PR with a test.

Steps to Reproduce

Parse an SES event that includes replyTo in commonHeaders with SesModel.

Powertools for AWS Lambda (Python) version

latest

AWS Lambda function runtime

3.12

Packaging format used

PyPi