smtp2mqtt's Introduction

smtp2mqtt

Simple SMTP to MQTT relay/forwarder.

Ever wanted to just forward your alert e-mails to MQTT? smtp2mqtt can do it.

Features

Single executable (thanks to Go!)
Linux/Windows/Mac/BSD support
multipart text/html e-mails supported
(optional) JSON support

Examples

Here is quick example, just to get idea what you can do with it.

Quick Examples

Start server:

$ ./smtp2mqtt -listen 0.0.0.0:10025
2019/10/22 21:51:25 Listening on: 0.0.0.0:10025

Run SMTP server forwarder and forward to MQTT 192.168.1.1 in JSON:

$ ./smtp2mqtt -json -topic smtp/ -mqtt tcp://192.168.1.1:1883
2019/10/22 21:52:25 Listening on: 0.0.0.0:10025

Download

You can find binary and source releases on Github under "Releases". Here's the link to the latest release

Options explained

$ ./smtp2mqtt
Usage of ./smtp2mqtt:
  -allow string
    	Allow only specific IPs to send e-mail (e.g. 192.168.1.)
  -debug
    	Enable debug messages
  -deny string
    	Deny specific IPs to send e-mail (e.g. 192.168.1.10)
  -json
    	post to MQTT topic as json
  -keep
    	keep connection to MQTT
  -listen string
    	Listen on specific IP and port (default "0.0.0.0:10025")
  -mqtt string
    	connect to specified MQTT server (default "tcp://127.0.0.1:1883")
  -password string
    	MQTT password for connecting
  -topic string
    	prepend specified string to MQTT topic (e.g. 'smtp/')
  -user string
    	MQTT username for connecting
  -version
    	Display version
  -welcome string
    	Welcome message for SMTP session (default "MQTT-forwarder ESMTP ready.")

Building

Linux/Mac/POSIX builds

Just type:

go build

Static compiling:

CGO_ENABLED=0 go build -ldflags "-extldflags -static"

Windows builds

Just type:

go build

ToDo

Implement TLS support for MQTT

Done

Implement JSON support

Credits

Vlatko Kosturjak

smtp2mqtt's People

Contributors

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smtp2mqtt's Issues

502 AUTH not supported

Hello, I am trying to use this smtp2mqtt server to receive email from my IP camera when they detected motion to trigger stuff on my home automation system.

It seems that I cannot configure my camera to properly connect, however I have been able to connect to the smtp2mqtt from thunderbird email client as well as directly sending SMTP commands over telnet both from the same box that the server is running on as well as other boxes on my LAN.

In trying to debug this I stopped smtp2mqtt and started a dummy SMTP server that just prints what it receives to the console. It seems that my camera tries to connect with the following:

Incoming connection from ('192.168.1.136', 55023)
Peer: ('192.168.1.136', 55023)
Data: 'EHLO localhost'
Data: 'HELO localhost'
Data: 'AUTH LOGIN'
Data: 'QUIT'

So then I stopped my dummy SMTP server and restarted smtp2mqtt. Next I connected via telnet and entered the same commands to see what the response was from smtp2mqtt, here is what I got:

tom@mythfe:~$ telnet 192.168.1.50 10025
Trying 192.168.1.50...
Connected to 192.168.1.50.
Escape character is '^]'.
220 MQTT-forwarder ESMTP ready.
helo test
250 Go ahead
AUTH LOGIN
502 AUTH not supported.

So, it seems that auth login is not supported and that my camera then closes the connection when receiving this command - since it cannot proceed

I am starting the server with a uname/passwd defined so I am surprised this is rejected:

./smtp2mqtt_linux_amd64 -json -topic orbital/motion -mqtt tcp://127.0.0.1:1883 -listen 192.168.1.50:10025 -user test -password test -debug

There seems to be no way to stop my camera from sending this auth string. Is this expected behavior for this server?

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