https://github.com/tuck1s/go-smtpproxy

Go package for transparent SMTP proxying, based on https://github.com/emersion/go-smtp
https://github.com/tuck1s/go-smtpproxy

golang proxy smtp smtp-client smtp-server

Last synced: 6 months ago
JSON representation

Go package for transparent SMTP proxying, based on https://github.com/emersion/go-smtp

• Host: GitHub
• URL: https://github.com/tuck1s/go-smtpproxy
• Owner: tuck1s
• License: apache-2.0
• Created: 2019-08-27T10:42:23.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2020-03-20T20:42:55.000Z (over 6 years ago)
• Last Synced: 2024-06-20T15:03:19.198Z (about 2 years ago)
• Topics: golang, proxy, smtp, smtp-client, smtp-server
• Language: Go
• Homepage:
• Size: 2.92 MB
• Stars: 13
• Watchers: 2
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# go-smtpproxy

[![Build Status](https://travis-ci.org/tuck1s/go-smtpproxy.svg?branch=master)](https://travis-ci.org/tuck1s/go-smtpproxy)

[![Coverage Status](https://coveralls.io/repos/github/tuck1s/go-smtpproxy/badge.svg?branch=master)](https://coveralls.io/github/tuck1s/go-smtpproxy?branch=master)

Go package, based heavily on [emersion's go-gmtp](https://github.com/emersion/go-smtp), with increased transparency of response codes and no sasl dependency.

The purpose of this is to provide functions that act as a server to receive SMTP messages from your downstream client. These SMTP messages are relayed through to

an upstream server.

The command / response exchanges are passed on transparently.

STARTTLS can be offered to the downstream client if you configure a valid certificate/key pair.

STARTTLS can be requested from the upstream server.

[Line splitting](linesplitter.go) functions are included for base64 encoded email handling by your app.

Get this project with `go get github.com/tuck1s/go-smtpproxy`.

`cmd/proxy` contains an example command-line app using this library:

```bash

cd cmd/proxy

go build

./proxy -h

SMTP proxy that accepts incoming messages from your downstream client, and relays on to an upstream server.

Usage of ./proxy:

  -certfile string

        Certificate file for this server

  -downstream_debug string

        File to write downstream server SMTP conversation for debugging

  -in_hostport string

        Port number to serve incoming SMTP requests (default "localhost:587")

  -insecure_skip_verify

        Skip check of peer cert on upstream side

  -logfile string

        File written with message logs (also to stdout)

  -out_hostport string

        host:port for onward routing of SMTP requests (default "smtp.sparkpostmail.com:587")

  -privkeyfile string

        Private key file for this server

  -verbose

        print out lots of messages

```