Sendmail `mail` with AWS SES

ses_mail.py

#! /usr/bin/env python

"""
A very basic script that emulates Sendmail's `mail` command, sending emails
with [aws-cli](https://github.com/aws/aws-cli). It replicates the minimum
amount of functionality for delivery [Munin notifications](
http://munin-monitoring.org/wiki/HowToContact) (e.g. `contact.email.command
ses_mail -s "Munin-notification for ${var:group} :: ${var:host}" your@email
.address.here`
).
"""

import sys, argparse, json
from subprocess import call

parser = argparse.ArgumentParser()
parser.add_argument('-s', '--subject', help='Email subject')
parser.add_argument("to")
args = parser.parse_args()

message = {
    'Body': {
        'Text': {
            'Data': ''.join(sys.stdin.readlines()),
            'Charset': 'UTF-8',
        }
    }
}

call([
    "aws",
    "--region",
    "us-east-1",
    "ses",
    "send-email",
    "--from",
    "[email protected]",
    "--to",
    args.to,
    "--subject",
    args.subject or 'Empty subject',
    "--message",
    json.dumps(message),
])