使用 Golang 编写的小型 SMTP 服务器
[!IMPORTANT] Hi, my name is Philipp and I am one of the contributors to this project. Sadly it seems as if the original owner has abandonded go-guerilla. As I think there are still some nice things to do with it, and there might be some issues here and there, I have decided to revive this project.
I've already mirrored the repository to https://github.com/phires/go-guerrilla as I have not complete full access to this repo and don't know if it will disappear at some point. I will also try to migrate all further relevant informations (e.g. Wiki and Issues) over to the new repo.
If the original owner decides to come back I'll glady hand over full control of the projekt back to him. This should by no means be misinterpreted as a "hostile takeover" or anything. I just want to get this mighty fine piece of software back to speed and give it some further development.
-- 2023-08-31 Philipp
Latest: v1.6.1, tagged on Dec 28, 2019 (Pull requests from #129 to #203)
A lightweight SMTP server written in Go, made for receiving large volumes of mail. To be used as a package in your Go project, or as a stand-alone daemon by running the "guerrillad" binary.
Supports MySQL and Redis out-of-the-box, with many other vendor provided processors, such as MailDir and even FastCGI! See below for a list of available processors.
It's an SMTP server written in Go, for the purpose of receiving large volumes of email. It started as a project for GuerrillaMail.com which processes millions of emails every day, and needed a daemon with less bloat & written in a more memory-safe language that can take advantage of modern multi-core architectures.
The purpose of this daemon is to grab the email, save it, and disconnect as quickly as possible, essentially performing the services of a Mail Transfer Agent (MTA) without the sending functionality.
The software also includes a modular backend implementation, which can extend the email processing functionality to whatever needs you may require. We refer to these modules as "Processors". Processors can be chained via the config to perform different tasks on received email, or to validate recipients.
See the list of available Processors below.
For more details about the backend system, see the: Backends, configuring and extending page.
The software is using MIT License (MIT) - contributors welcome.
Pull requests / issue reporting & discussion / code reviews always welcome. To encourage more pull requests, we are now offering bounties.
Take a look at our Bounties and Roadmap page!
(Assuming that you have GNU make and latest Go on your system)
Go-Guerrilla uses Dep to manage
dependencies. If you have dep installed, just run dep ensure as usual.
You can also run $ go get ./.. if you don't want to use dep, and then run $ make test
to ensure all is good.
To build the binary run:
$ make guerrillad
This will create a executable file named guerrillad that's ready to run.
See the build notes for more details.
Next, copy the goguerrilla.conf.sample file to goguerrilla.conf.json.
You may need to customize the pid_file setting to somewhere local,
and also set tls_always_on to false if you don't have a valid certificate setup yet.
Next, run your server like this:
$ ./guerrillad serve
The configuration options are detailed on the configuration page. The main takeaway here is:
The default configuration uses 3 processors, they are set using the save_process
config option. Notice that it contains the following value:
"HeadersParser|Header|Debugger" - this means, once an email is received, it will
first go through the HeadersParser processor where headers will be parsed.
Next, it will go through the Header processor, where delivery headers will be added.
Finally, it will finish at the Debugger which will log some debug messages.
Where to go next?
Go-Guerrilla can be imported and used as a package in your Go project.
import (
"github.com/flashmob/go-guerrilla"
)
You should use the dep ensure command to get all dependencies, as Go-Guerrilla uses
dep for dependency management.
Otherise, $ go get ./... should work if you're in a hurry.
This will start a server with the default settings, listening on 127.0.0.1:2525
d := guerrilla.Daemon{}
err := d.Start()
if err == nil {
fmt.Println("Server Started!")
}
d.Start() does not block after the server has been started, so make sure that you keep your program busy.
The defaults are:
debug"HeadersParser|Header|Debugger where it will log the received emails.Next, you may want to change the interface (127.0.0.1:2525) to the one of your own choice.
Please continue to the API documentation for the following topics:
The main job of a Go-Guerrilla backend is to validate recipients and deliver emails. The term "delivery" is often synonymous with saving email to secondary storage.
The default backend implementation manages multiple workers. These workers are composed of smaller components called "Processors" which are chained using the config to perform a series of steps. Each processor specifies a distinct feature of behaviour. For example, a processor may save the emails to a particular storage system such as MySQL, or it may add additional headers before passing the email to the next processor.
To extend or add a new feature, one would write a new Processor, then add it to the config. There are a few default processors to get you started.
| Processor | Description |
|---|---|
| Compressor | Sets a zlib compressor that other processors can use later |
| Debugger | Logs the email envelope to help with testing |
| Hasher | Processes each envelope to produce unique hashes to be used for ids later |
| Header | Add a |
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