Python script to send mails with append

mailto.py

import argparse
import smtplib
from email.message import EmailMessage
import mimetypes


# Parser
parser = argparse.ArgumentParser(description="Send files through mail")

parser.add_argument("files", metavar="FILES", nargs="+", help="Files to send")
parser.add_argument(
    "-r",
    "--recipient",
    required=False,
    action="append",
    metavar="RECIPIENT",
    default=["me"],
    dest="recipients",
    help="A To: header value",
)

args = parser.parse_args()


# Recipients
rcp = {
    "me": "asd@asd.com",
    "someone_else": "asdasd@asd.com"
}

recipients = [rcp[person] for person in args.recipients]


# Construyo el mail
email = EmailMessage()
email["from"] = "from@asd.com"
email["to"] = ", ".join(recipients)
email["subject"] = " ".join(args.files)


# Append the files
for filename in args.files:
    # Guess the content type based on the file's extension.
    # If no guess could be made, or the file is encoded (compressed),
    # so use a generic bag-of-bits type.
    ctype, encoding = mimetypes.guess_type(filename)
    if ctype is None or encoding is not None:
        ctype = "application/octet-stream"
    maintype, subtype = ctype.split("/", 1)

    with open(filename, "rb") as fp:
        email.add_attachment(
            fp.read(), maintype=maintype, subtype=subtype, filename=filename
        )


# Send
with smtplib.SMTP(host="AAAAA", port=587) as smtp:
    smtp.starttls()
    smtp.login("AAAAA", "AAAAA")
    smtp.send_message(email)
    print("Sent!")