        +---------+    +------------+
mail -> | Minasan | -> | SMTP Relay +--+-> Alice
        +---+-----+    +------------+  |
            | REST                     +-> Bob
            v                          |
        +---------+                    +-> Charly
        | Gitlab  |
        +---------+

Minasan doesn't send mails directly to users, nobody does that, but uses a relay, something like Postfix, that handle greylist, bounce, reputation and all that voodoo dances.

Minasan uses Gitlab REST API, with a private token. Great for using, boring for testing. Gitlab REST API doesn't expose user + project = ☆, what a pity.

Demo time

You need Docker, golang build tools, a Gitlab instance with sufficient privileges.

Build

make build

The application is here : bin/minasan

Launch mailhog

make mailhog

The mailhog web interface is here : http://127.0.0.1:8025

You need a config file (or some ENVs, or some cli flags)

---
gitlab_private_token: shmurtz
gitlab_domain: gitlab.example.com
smtp_out: 127.0.0.1:1025
smtp_domain: example.com

./bin/minasan -c config.yml

Send some mails

./debug_client.py [email protected]

Usage

Minasan uses go-guerilla, viper and cobra

Go-guerilla receives and routes incoming mails, Cobra provides complex documented CLI options, Viper handles ENV and configuration files.

$ ./bin/minasan -h
Send mail to gitlab projects

Usage:
  minasan [command]

Available Commands:
  gitlab      Ask gitlab wich mails are linked to a specific project
  help        Help about any command
  serve       Listen as a SMTP server

Flags:
  -c, --config string                 Config file
  -g, --gitlab_domain string          Gitlab domain (default "gitlab.example.com")
  -t, --gitlab_private_token string   Gitlab private token
  -h, --help                          help for minasan

Use "minasan [command] --help" for more information about a command.

And for the serve command:

./bin/minasan serve -h
Listen as a SMTP server

Usage:
  minasan serve [flags]

Flags:
  -h, --help                     help for serve
  -H, --metrics_address string   Prometheus probe listening address (default "127.0.0.1:8125")
  -d, --smtp_domain string       SMTP domain (default "gitlab.example.com")
  -i, --smtp_in string           SMTP input service (default "127.0.0.1:2525")
  -o, --smtp_out string          SMTP relay (default "127.0.0.1:25")

Global Flags:
  -c, --config string                 Config file
  -g, --gitlab_domain string          Gitlab domain (default "gitlab.example.com")
  -t, --gitlab_private_token string   Gitlab private token

API

Minasan is a simple SMTP server, unauthenticated.

Minasan 127.0.0.1:2525 and talks SMTP.

You send a mail to {group}.{project}@{domain}. domain is the -d option, an arbitrary name, go-guerilla loves routing, and a domain is mandatory.