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All Projects → mback2k → smtp-dkim-signer

mback2k / smtp-dkim-signer

Licence: GPL-3.0 License
SMTP-proxy that DKIM-signs e-mails before submission to an upstream SMTP-server.

Programming Languages

go
31211 projects - #10 most used programming language
Dockerfile
14818 projects

Labels

smtpdkimsmtp-servergolang-application

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smtp-dkim-signer

This Go program is a SMTP-proxy that DKIM-signs e-mails before submission to an upstream SMTP-server.

Build Status GoDoc Go Report Card

Dependencies

Special thanks to @emersion for creating and providing the following Go libraries that are the main building blocks of this program:

Additional dependencies are the following awesome Go libraries:

Installation

You basically have two options to install this Go program package:

  1. If you have Go installed and configured on your PATH, just do the following go get inside your GOPATH to get the latest version:
go get -u github.com/mback2k/smtp-dkim-signer
  1. If you do not have Go installed and just want to use a released binary, then you can just go ahead and download a pre-compiled Linux amd64 binary from the Github releases.

Finally put the smtp-dkim-signer binary onto your PATH and make sure it is executable.

Configuration

The following YAML file is an example configuration with one virtual host:

Address: "localhost:25"
Domain: "localhost"
LetsEncrypt:
  Agreed: true
  Contact: [email protected]
  Challenge: http
  ChallengePort: 80
VirtualHosts:
  - Domain: your-domain.tld
    Upstream: "your-upstream-smtp:465"
    Selector: "your-dkim-selector"
    PrivKeyPath: "your-private-key-file" OR |
      your-private-key-data
    HeaderCan: "relaxed"
    BodyCan: "simple"
HeaderKeys:
  - "From"
  - "Reply-To"
  - "Subject"
  - "Date"
  - "To"
  - "Cc"
  - "In-Reply-To"
  - "References"
  - "Message-ID"
  - "Resent-Date"
  - "Resent-From"
  - "Resent-To"
  - "Resent-Cc"
# optional:
Rollbar:
  AccessToken: "your-rollbar-access-token"
  Environment: production

Save this file in one of the following locations and run ./smtp-dkim-signer:

  • /etc/smtp-dkim-signer/smtp-dkim-signer.yaml
  • $HOME/.smtp-dkim-signer.yaml
  • $PWD/smtp-dkim-signer.yaml

License

Copyright (C) 2018 - 2020, Marc Hoersken [email protected]

This software is licensed as described in the file LICENSE, which you should have received as part of this software distribution.

All trademarks are the property of their respective owners.

Note that the project description data, including the texts, logos, images, and/or trademarks, for each open source project belongs to its rightful owner. If you wish to add or remove any projects, please contact us at [email protected].