Just to link to the app: https://github.com/nextcloud/mail
Also @ChristophWurst @Gomez and @jan are already here 
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Actually, itās both. Itās a file and ādataā repo AND a GUI for both, but the current Mail app is a strange animal, because it manages data which sits outside of xyzCloud, so there is little reason to use it (just add contacts and calendars to a webmail instead), but itās quite popular, so itās here to stay and maybe one day it will store messages locally.
EDIT: Itās true that some other apps also manage files stored on proprietary clouds, so maybe itās not such a strange concept to manage external data.
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There are already great open source mail servers such as postfix or exim. Someone could provide a configuration sample for the mailserver together with a configuration interface plugin for owncloud (like postfixadmin or vexim).
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I donāt think this is necessary because all these standard tools live on their own. They have their own documentation and their own prerequisites.
The mail App just uses standard protocols in a standard way (yes, the mail.app developers even documented what has to be altered for google and for exim), so I assume all is covered. *cloud and mail.app are independent of the mail tools.
If you look for an easy way of self-hosting a mail server then http://mailcow.email might be worth a look. Otherwise the Owncloud (now Nextcloud 
) mail app does the job for providing access to mailboxes IMO.
You should take a look at www.nethserver.org it has already integrated owncloud 9.x with one click install, making a module also for nextcloud would be very cool and interesting. NethServerās straightforward to install and administrate, all through a modern webUI and based on CentOS
Iām happy to see this new project, I have waited for @josās next move for a while. Hi @jospoortvliet
Disclosure: Iām the NethServer community guy 
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Beyond of what had be said, mail servers are too complex security-wise to be integrated into anything.
I think if Nextcloud find a way to make
to create a plugin for Nextcloud would be a lot of more interesting for everyone.
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Iām in the ānoā camp here. Where Nextcloudās functionality excels is its ability to integrate with other solutions and serve as a central command, per-se. It shouldnāt be a mail server; it should be able to talk to one, though. Thatās why the plugin architecture is fantastic for this.
A mail server is something completely different. If you want to have a PHP-JS-Mail-server you can always look for or create an app for that. Until then, you should try your own mail server and you will soon realize why there are so few rolling their own.
Including a mail server is a whole nother ballgame.
The Mail Client on the other hand is being worked on AFAIK.
Ok let met change my suggestion to improve the mail server integration instead of create a Nextcloud mail server 
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yeah, thatās what the Mail app is all about. And we want to deeply integrate it, like Calendar and Contacts.
Hi @alefattorini !!! Nice to see you here. Nethserver offers a great base for Nextcloud, once we have our first release (very, very soon!) we can sure see if we can promote the combination
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Maybe @ChristophWurst and @Gomez of the Mail app want to state their plans here?
@xandcg just as a note ā Protonmail claim they are open source but are not really, see https://twitter.com/jancborchardt/status/740219550805987332
This has been discussed before (canāt find the issue ATM) and I am still convinced that we should not re-invent the wheel. There is no sane reason to implement that ourselves if we can use a standardized protocol to communicate with existing, well tested, open source IMAP severs.
However, as mentioned, Iād welcome if someone documents how admins can set up and configure the Mail app and an external (but on their own servers) mail server
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Mail app + a good turnkey mail server easy to administrate + nextcloud installation with 1 click = awesome!
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Caveat here: It is not so easy to setup your own mail server; with good reason, exim4 and postfix and dovecot documentation spans dozens of pages with myriads of topics; you want to have secure access, spam protection, user authentication, DKIM, MX failover, basic integration of virus protection - just to name a few. Thatās all off topic here and well documented where it belongs to. We should concentrate on a working mail client integration - there are enough things to do and to contribute (like ics attachment detectionā> calendar; attachment handling --> data, signature handling).
I wholeheartedly agree, the last thing you want is to grow the army of misconfigured, unmanaged mail servers, ready to be abused by bots.
Mail-in-a-box is a mail server that (at the moment, at least) incorporates Owncloud 8.2 for contacts & calendars.
Sadly, the developer is looking for an alternative to owncloud due to some past problems with owncloud upgradesā¦
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perhaps a migration to Nextcloud would be a good idea 
On the subject of a mail server as part of Nextcloud, that seems a very bad idea to me, to be honest. We built end user software, not such infrastructural things. It is not only a monumental task but also not suited to what we do.
I wouldnāt stop somebody who wants to write a new mail server but I donāt think it is something ownCloud needs, on the contrary.
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Already warned ownCloud about this bad news (that mailinabox wants to go away from ownCloud).
Here is the issue if you want to discuss.
well I added a note that weāve released Nextcloud 9 but it is up to them to spend/waste time on migrating to another tool of course.
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