No invitation mail is send to the attendees of an appointment of a shared calendar (but cancel mail is)

[mxlse]

Steps to reproduce

1. Create a shared calendar
2. Create an appointment with one of the users the calendar is shared with (in Nextcloud or via Thunderbird)
3. Invite an attendee to the appointment

Expected behaviour

An invitation should be send to the attendees. This is working fine if I send an invitation from the personal (not shared) calendar - with Thunderbird and the Nextcloud interface.

Actual behaviour

No invitation mail is send. The more or less annoying thing is that a cancel mail IS send, when the appointment gets deleted, although the invitation mail was missing.

Server configuration

Operating system: Ubuntu 16.04.2 LTS

Web server: Apache 2.4.18 behind nginx 1.11.12 reverse proxy

Database: mysql 5.7.18

PHP version: php 7.1.2-3 (oracle)

Nextcloud version: 11.0.2 / 12.0.0

Updated from an older Nextcloud/ownCloud or fresh install: updated from owncloud / nextcloud 10

Where did you install Nextcloud from: https://nextcloud.com/install/

Signing status:

Signing status

No errors have been found.

Nextcloud configuration:

Config report

$CONFIG = array (
  'instanceid' => '***',
  'passwordsalt' => '***',
  'secret' => '***',
  'trusted_domains' =>
  array (
    0 => 'A',
    1 => 'B',
    2 => 'C',
    3 => 'D',
  ),
  'trusted_proxies' =>
  array (
    0 => 'xxx.xxx.xxx.xxx',
  ),
  'forwarded_for_headers' =>
  array (
    0 => 'HTTP_X_FORWARDED',
    1 => 'HTTP_FORWARDED_FOR',
  ),
  'datadirectory' => '/home/nextcloud',
  'overwrite.cli.url' => 'https://my.url.com',
  'dbtype' => 'mysql',
  'version' => '11.0.2.7',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbtableprefix' => 'oc_',
  'dbuser' => '***',
  'dbpassword' => '***',
  'installed' => true,
  'forcessl' => true,
  'forceSSLforSubdomains' => true,
  'loglevel' => 4,
  'theme' => '',
  'mail_from_address' => '***',
  'mail_smtpmode' => 'smtp',
  'mail_domain' => '***',
  'mail_smtpauth' => 1,
  'mail_smtphost' => '***',
  'mail_smtpname' => '***',
  'mail_smtppassword' => '***',
  'mail_smtpport' => '25',
  'maintenance' => false,
  'trashbin_retention_obligation' => 'auto',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.distributed' => '\\OC\\Memcache\\Memcached',
);

Are you using external storage, if yes which one: no

Are you using encryption: no

Are you using an external user-backend, if yes which one: Webdav

Client configuration

Browser: Chrome/Opera/Vivaldi/Firefox

Operating system: Windows (7, 8, 10), Linux (Ubuntu, Mint,...)

[mxlse]

I just did the update to Nextcloud 12.0.0 - still the same behaviour.

[MorrisJobke]

cc @georgehrke

[tobiasv]

We have exactly the same issue. We still use version 11.

[MorrisJobke]

Duplicate of #3830