A mailing list manager (MLM or email discussion list software) that runs on AWS Lambda (with help from SES and S3).
LambdaMLM is not production-ready. Use LambdaMLM at your own risk.
Planned enhancements, bugs, and known limitations are tracked in GitHub Issues.
Setup requires familiarity with AWS—in particular, having credentials already set up locally and having familiarity with SES, IAM, and Lambda will help. A rough outline of how to set up LambdaMLM is here.
Isaac Greenspan, with some time contributed by Vokal.