✨ Rewrite as python smtpd extension

Dockerfile

@@ -0,0 +1,12 @@
+FROM zammad/zammad-docker-compose:zammad
+
+ENV ZAMMAD_DIR /home/zammad
+
+RUN apt-get update -qq && apt-get install -y python3
+
+WORKDIR /smtp
+ADD server.py /smtp/
+
+EXPOSE 25
+
+CMD ["python3", "server.py"]

server.py

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+import asyncore
+import os
+from smtpd import SMTPServer
+from subprocess import Popen, PIPE
+
+class ZammadServer(SMTPServer):
+    def process_message(self, peer, mailfrom, rcpttos, data, **kwargs):
+        print(data)
+        pipe = Popen("bundle exec rails r 'Channel::Driver::MailStdin.new(trusted: true)'", shell=True, cwd=os.environ['ZAMMAD_DIR'], stdin=PIPE).stdin
+        pipe.write(data.encode('utf-8'))
+        pipe.close()
+
+def run():
+    serv = ZammadServer(('0.0.0.0', 25), None)
+    try:
+        asyncore.loop()
+    except KeyboardInterrupt:
+        pass
+
+
+if __name__ == '__main__':
+    run()