Add SnappyMail webmail

[the-djmaze]

https://snappymail.eu/

What type of PR?

Feature

What does this PR do?

Add SnappyMail as webmail option

Prerequistes

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.

• In case of feature or enhancement: documentation updated accordingly
• Unless it's docs or a minor change: add changelog entry file.

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[parisni]

SnappyMail can be backed by postgres AFAIK ? That would be nice to optionally provide postgres then for it (as admin and roundcube do)
otherwise I failed to make it working, 500 error and the container logs :

webmail_1    | [Fri Jun 04 19:37:41.627648 2021] [core:alert] [pid 23] [client 127.0.0.1:59524] /var/www/html/.htaccess: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included in the server configuration

[parisni]

maybe mount something like /mailu/webmail/snappymail to avoid collision with other webmails ?

[the-djmaze]

maybe mount something like /mailu/webmail/snappymail to avoid collision with other webmails ?

Would be nice if i knew how.
Seems that the others (RoundCube and RainLoop) don't have that either.

[the-djmaze]

SnappyMail can be backed by postgres AFAIK ? That would be nice to optionally provide postgres then for it (as admin and roundcube do)

PDO is only used when activating the Addressbook feature.
Since it is PDO you can use: mysql, pgsql or sqlite

otherwise I failed to make it working, 500 error and the container logs :

webmail_1    | [Fri Jun 04 19:37:41.627648 2021] [core:alert] [pid 23] [client 127.0.0.1:59524] /var/www/html/.htaccess: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included in the server configuration

Thanks, i solved that issue

[Diman0]

After internal discussion we have decided not to accept this PR. Two webmails are sufficient for the project. The Mailu project always had a very low amount of active contributors. We cannot use another webmail that adds more cost of ownership. We would have to maintain this and update it for every future release. Any webmail is basically an IMAP client. You can simply run your own image of SnappyMail and connect via IMAP to Mailu.