Untested code

.gitignore

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+__pycache__/
+*.pyc
+*.swp
+settings.ini
+venv/
+.vscode

classes/config.py

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+import configparser
+import pathlib
+
+class Config:
+    @classmethod
+    def fromFile(cls, path):
+        parser = configparser.ConfigParser()
+        parser.read(path)
+        return cls(parser)
+
+    def __init__(self, config):
+        self._config = config
+
+    def getTempDir(self):
+        return pathlib.Path(self._config["MONSTER"].get("TempDir", fallback="/tmp/MailMonster/"))
+
+    def getMailServer(self):
+        return self._config["MONSTER"].get("Server", fallback="localhost")
+
+    def getMailPort(self):
+        return int(self._config["MONSTER"].get("Port", fallback=0))
+
+    def getMailSSL(self):
+        return bool(int(self._config["MONSTER"].get("SSL", fallback=0)))
+
+    def getMailUsername(self):
+        return self._config["MONSTER"].get("Username")
+
+    def getMailPassword(self):
+        return self._config["MONSTER"].get("Password")
+
+    def getMailSender(self):
+        return self._config["MONSTER"].get("Sender")

classes/mission.py

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+import configparser
+import json
+
+from email.message import EmailMessage
+
+class Mission:
+    @classmethod
+    def fromFile(cls, path):
+        mission = configparser.ConfigParser()
+        mission.read(path)
+
+        mission = mission["MISSION"]
+
+        return cls(json.loads(mission["Recipients"]), mission.get("Sender"), mission.get("Subject"), mission.get("Content"), json.loads(mission.get("Files", fallback="[]")))
+
+    def __init__(self, recipients, sender=None, subject=None, text=None, attachments=None):
+        self.recipients = recipients
+        self.sender = sender
+        self.subject = subject
+        self.text = text
+        self.attachments = attachments
+
+    def to_message(self):
+        message = EmailMessage()
+
+        message.set_content(self.text)
+
+        for attachment in self.attachments:
+            try:
+                content = open(attachment, "rb").read()
+                message.add_attachment(content)
+
+            except:
+                pass
+
+        message["From"] = self.sender
+        message["To"] = ",".join(self.recipients)
+        message["Subject"] = self.subject
+
+        return message

classes/smtp.py

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+import smtplib
+
+
+class SMTP:
+    @classmethod
+    def fromConfig(cls, config):
+        return cls(config.getMailServer(), config.getMailUsername(), config.getMailPassword(), config.getMailSender(), config.getMailPort(), config.getMailSSL())
+
+    def __init__(self, host, username=None, password=None, sender=None, port=None, ssl=None):
+        port = 0 if port is None else port
+        ssl = bool(ssl)
+
+        smtpclass = smtplib.SMTP_SSL if ssl else smtplib.SMTP
+
+        self.connection = smtpclass(host, port)
+        self.connection.login(username, password)
+
+        self.sender = sender
+
+    def send_message(self, message, *args, **kwargs):
+        if not message.get("From"):
+            message["From"] = self.sender
+
+        self.connection.send_message(message, *args, **kwargs)
+
+    def __del__(self):
+        self.connection.close()

mission.sample.mmm

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+[MISSION]
+Files = [
+    "/location/file1",
+    "/location/file2"
+    ]
+Recipients = [ "recipient@example.com" ]
+Subject = Your Requested Files
+Content = Hello,
+    
+    this is your message.
+    
+    Best regards!

settings.dist.ini

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+[MONSTER]
+TempDir = /tmp/MailMonster/
+Sender = monster@example.com
+Server = example.com
+Username = monster@example.com
+Password = dkafjöfi925hqojtwkb
+SSL = 1
+Port = 465

worker.py

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+#!/usr/bin/env python3
+
+import pathlib
+
+from classes.config import Config
+from classes.mission import Mission
+from classes.smtp import SMTP
+
+
+config = Config("settings.ini")
+
+tempdir = pathlib.Path(config["MONSTER"].get("TempDir", "/tmp/MailMonster/"))
+
+if not tempdir.exists():
+    tempdir.mkdir()
+
+elif not tempdir.isdir():
+    raise ValueError(f"Temp Dir {str(tempdir)} exists and is not a directory.")
+
+messages = []
+
+for f in tempdir.glob("*.mmm"):
+    mission = Mission.fromFile(f)
+    messages.append(mission.to_message())
+
+smtp = SMTP.fromConfig(config)
+
+for message in messages:
+    smtp.send_message(message)