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bors[bot] 0839490beb
Merge #2479 
2479: Rework the anti-spoofing rule r=mergify[bot] a=nextgens

## What type of PR?

Feature

## What does this PR do?

We shouldn't assume that Mailu is the only MTA allowed to send emails on behalf of the domains it hosts.
We should also ensure that it's non-trivial for email-spoofing of hosted domains to happen

Previously we were preventing any spoofing of the envelope from; Now we are preventing spoofing of both the envelope from and the header from unless some form of authentication passes (is a RELAYHOST, SPF, DKIM, ARC)

### Related issue(s)
- close #2475

## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [x] In case of feature or enhancement: documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.


Co-authored-by: Florent Daigniere <nextgens@freenetproject.org>
 		2 years ago
.github Forgot to update both deploy jobs 2 years ago
core Merge #2479 2 years ago
design Switch from RainLoop to SnappyMail 3 years ago
docs Merge #2479 2 years ago
optional Move curl to base image 2 years ago
setup Merge #2328 2 years ago
tests Merge #2460 2 years ago
towncrier Merge #2479 2 years ago
webmails Fix a bunch of typos 2 years ago
.gitignore Update .gitignore file 2 years ago
.mergify.yml Preparations for 1.9 release. 3 years ago
AUTHORS.md Update AUTHORS.md 3 years ago
CHANGELOG.md Warn about rollbacks not working 3 years ago
CODE_OF_CONDUCT.md Add a code of conduct, fixes #319 7 years ago
CONTRIBUTING.md Fix a bunch of typos 2 years ago
ISSUE_TEMPLATE.md Improve ISSUE_TEMPLATE.md 2 years ago
LICENSE.md Rename the freeposte/mailu directory and database 8 years ago
PULL_REQUEST_TEMPLATE.md fix spelling 3 years ago
README.md Add anti-spoofing to the feature list 2 years ago
RELEASE_TEMPLATE.md changed semver example to 1.9.x 3 years ago
SECURITY.md Create SECURITY.md 2 years ago
bors.toml Switch to github actions for CI/CD 3 years ago
pyproject.toml Fix the package setting 5 years ago

README.md

Mailu

Mailu is a simple yet full-featured mail server as a set of Docker images. It is free software (both as in free beer and as in free speech), open to suggestions and external contributions. The project aims at providing people with an easily setup, easily maintained and full-featured mail server while not shipping proprietary software nor unrelated features often found in popular groupware.

Most of the documentation is available on our Website, you can also try our demo server before setting up your own, and come talk to us on Matrix.

Features

Main features include:

  • Standard email server, IMAP and IMAP+, SMTP and Submission with autoconfiguration profiles for clients
  • Advanced email features, aliases, domain aliases, custom routing
  • Web access, multiple Webmails and administration interface
  • User features, aliases, auto-reply, auto-forward, fetched accounts
  • Admin features, global admins, announcements, per-domain delegation, quotas
  • Security, enforced TLS, DANE, MTA-STS, Letsencrypt!, outgoing DKIM, anti-virus scanner
  • Antispam, auto-learn, greylisting, DMARC and SPF, anti-spoofing
  • Freedom, all FOSS components, no tracker included

Domains

Contributing

Mailu is free software, open to suggestions and contributions. All components are free software and compatible with the MIT license. All specific configuration files, Dockerfiles and code are placed under the MIT license.