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Merge pull request #787 from usrpro/update-faq

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Update faq
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@ -89,6 +89,51 @@ our ongoing `project management`_ discussion issue.
Deployment related
------------------
What is the difference between DOMAIN and HOSTNAMES?
````````````````````````````````````````````````````
Similar questions:
- Changing domain doesn't work
- Do I need a certificate for ``DOMAIN``?
``DOMAIN`` is the main mail domain. Aka, server identification for outgoing mail. DMARC reports point to ``POSTMASTER`` @ ``DOMAIN``.
These are really the only things it is used for. You don't need a cert for ``DOMAIN``, as it is a mail domain only and not used as host in any sense.
However, it is usual that ``DOMAIN`` gets setup as one of the many mail domains. None of the mail domains ever need a certificate.
TLS certificates work on host connection level only.
``HOSTNAMES`` however, can be used to connect to the server. All host names supplied in this variable will need a certificate. When ``TLS_FLAVOR=letsencrypt`` is set,
a certificate is requested automatically for all those domains.
So when you have something like this:
.. code-block:: bash
DOMAIN=example.com
POSTMASTER=me
HOSTNAMES=mail.example.com,mail.foo.com,bar.com
TLS_FLAVOR=letsencrypt
- You'll end up with a DMARC address to ``me@example.com``.
- Server identifies itself as the SMTP server of ``@example.com`` when sending mail. Make sure your reverse DNS hostname is part of that domain!
- Your server will have certificates for the 3 hostnames. You will need to create ``A`` and ``AAAA`` records for those names,
pointing to the IP addresses of your server.
- The admin interface generates ``MX`` and ``SPF`` examples which point to the first entry of ``HOSTNAMES`` but these are only examples.
You can modify them to use any other ``HOSTNAMES`` entry.
You're mail service will be reachable for IMAP, POP3, SMTP and Webmail at the addresses:
- mail.example.com
- mail.foo.com
- bar.com
.. note::
In this case ``example.com`` is not reachable as a host and will not have a certificate.
It can be used as a mail domain if MX is setup to point to one of the ``HOSTNAMES``. However, it is possible to include ``example.com`` in ``HOSTNAMES``.
*Issue reference:* `742`_, `747`_.
How does Mailu scale up?
````````````````````````
@ -123,6 +168,16 @@ For **service** HA, please see: `How does Mailu scale up?`_
.. _`spam magnet`: https://blog.zensoftware.co.uk/2012/07/02/why-we-tend-to-recommend-not-having-a-secondary-mx-these-days/
Does Mailu run on Rancher?
``````````````````````````
There is a rancher catalog for Mailu in the `Mailu/Rancher`_ repository. The user group for Rancher is small,
so we cannot promise any support on this when you're heading into trouble. See the repository README for more details.
*Issue reference:* `125`_.
.. _`Mailu/Rancher`: https://github.com/Mailu/Rancher
Can I run Mailu without host iptables?
``````````````````````````````````````
@ -147,15 +202,20 @@ correct syntax. The following file names will be taken as override configuration
- `Nginx`_ - All ``*.conf`` files in the ``nginx`` sub-directory.
- `Rspamd`_ - All files in the ``rspamd`` sub-directory.
*Issue reference:* `206`_.
.. _`Postfix`: http://www.postfix.org/postconf.5.html
.. _`Dovecot`: https://wiki.dovecot.org/ConfigFile
.. _`NGINX`: https://nginx.org/en/docs/
.. _`Rspamd`: https://www.rspamd.com/doc/configuration/index.html
.. _`Docker swarm howto`: https://github.com/Mailu/Mailu/tree/master/docs/swarm/master
.. _`125`: https://github.com/Mailu/Mailu/issues/125
.. _`165`: https://github.com/Mailu/Mailu/issues/165
.. _`177`: https://github.com/Mailu/Mailu/issues/177
.. _`332`: https://github.com/Mailu/Mailu/issues/332
.. _`742`: https://github.com/Mailu/Mailu/issues/742
.. _`747`: https://github.com/Mailu/Mailu/issues/747
.. _`520`: https://github.com/Mailu/Mailu/issues/520
.. _`591`: https://github.com/Mailu/Mailu/issues/591
@ -243,8 +303,18 @@ See also :ref:`external_certs`.
*Issue reference:* `426`_, `615`_.
How do I activate DKIM and DMARC?
```````````````````````
Go into the Domain Panel and choose the Domain you want to enable DKIM for.
Click the first icon on the left side (domain details).
Now click on the top right on the *"Regenerate Keys"* Button.
This will generate the DKIM and DMARC entries for you.
*Issue reference:* `102`_.
Do you support Fail2Ban?
````````````````````````
Fail2Ban is not included in Mailu. Fail2Ban needs to modify the host's IP tables in order to
ban the addresses. We consider such a program should be run on the host system and not
inside a container. The ``front`` container does use authentication rate limiting to slow
@ -267,12 +337,50 @@ spam filter weight settings.
*Issue reference:* `503`_.
rspamd: DNS query blocked on multi.uribl.com
````````````````````````````````````````````
This usually relates to the DNS server you are using. Most of the public servers block this query or there is a rate limit.
In order to solve this, you most probably are better off using a root DNS resolver, such as `unbound`_. This can be done in multiple ways:
- Use the *Mailu/unbound* container. This is an optional include when generating the ``docker-compose.yml`` file with the setup utility.
- Setup unbound on the host and make sure the host's ``/etc/resolve.conf`` points to local host.
Docker will then forward all external DNS requests to the local server.
- Set up an external DNS server with root resolving capabilities.
In any case, using a dedicated DNS server will improve the performance of your mail server.
*Issue reference:* `206`_, `554`_, `681`_.
Is there a way to support more (older) ciphers?
```````````````````````````````````````````````
See `How can I override settings?`_ .
You will need to add the protocols you wish to support in an override for the ``front`` container (Nginx).
.. code-block:: bash
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers <list of ciphers>;
We **strongly** advice against downgrading the TLS version and ciphers!
*Issue reference:* `363`_, `698`_.
.. _`troubleshooting tag`: https://github.com/Mailu/Mailu/issues?utf8=%E2%9C%93&q=label%3Afaq%2Ftroubleshooting
.. _`85`: https://github.com/Mailu/Mailu/issues/85
.. _`102`: https://github.com/Mailu/Mailu/issues/102
.. _`116`: https://github.com/Mailu/Mailu/issues/116
.. _`171`: https://github.com/Mailu/Mailu/issues/171
.. _`206`: https://github.com/Mailu/Mailu/issues/206
.. _`363`: https://github.com/Mailu/Mailu/issues/363
.. _`426`: https://github.com/Mailu/Mailu/issues/426
.. _`503`: https://github.com/Mailu/Mailu/issues/503
.. _`554`: https://github.com/Mailu/Mailu/issues/554
.. _`584`: https://github.com/Mailu/Mailu/issues/584
.. _`592`: https://github.com/Mailu/Mailu/issues/592
.. _`615`: https://github.com/Mailu/Mailu/issues/615
.. _`681`: https://github.com/Mailu/Mailu/pull/681
.. _`698`: https://github.com/Mailu/Mailu/issues/698
.. _`unbound`: https://nlnetlabs.nl/projects/unbound/about/