Activity email notifications not working

[tuminik]

Hi, the same issue here.
owncloud 10.2.1
activity 2.5.0
cron.php every 15 min in system contrab.

Any log of activity to read?

Server configuration

Operating system: Ubuntu 18.04.2 LTS

Web server: Apache/2.4.29 (Ubuntu)

Database: mysql Ver 8.0.15 for Linux on x86_64 (MySQL Community Server - GPL)

PHP version: PHP 7.2.19-1+ubuntu18.04.1+deb.sury.org+1 (cli) (built: May 31 2019 11:17:15) ( NTS )

ownCloud version: 10.2.1.4
Where did you install ownCloud from:
initial 10.1.0 apt-get
lastest version: wget https://download.owncloud.org/community/owncloud-10.2.1.tar.bz2
sudo -u www-data php occ upgrade(https://doc.owncloud.com/server/admin_manual/maintenance/manual_upgrade.html)

Signing status (ownCloud 9.0 and above):

Login as admin user into your ownCloud and access 
http://example.com/index.php/settings/integrity/failed 
No errors have been found.

**List of activated apps:**
Enabled:
  - activity: 2.5.0
  - comments: 0.3.0
  - configreport: 0.2.0
  - dav: 0.4.0
  - federatedfilesharing: 0.4.0
  - federation: 0.1.0
  - files: 1.5.2
  - files_external: 0.7.1
  - files_sharing: 0.11.0
  - files_trashbin: 0.9.1
  - files_versions: 1.3.0
  - firstrunwizard: 1.2.0
  - impersonate: 0.5.0
  - market: 0.5.0
  - notifications: 0.5.0
  - provisioning_api: 0.5.0
  - systemtags: 0.3.0
  - templateeditor: 0.4.0
  - updatenotification: 0.2.1

**The content of config/config.php:**
{
    "system": {
        "updatechecker": true,
        "instanceid": "ocwihoob2ai6",
        "appstoreenabled": true,
        "upgrade.automatic-app-update": true,
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***",
        ],
        "datadirectory": "\/var\/www\/owncloud\/data",
        "overwrite.cli.url": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "10.2.1.4",
        "dbname": "owncloud",
        "dbhost": "localhost:5432",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "America\/Asuncion",
        "installed": true,
        "loglevel": 0,
        "cron_log": true,
        "log_rotate_size": 104857600,
        "activity_expire_days": 365,
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpsecure": "ssl",
        "mail_smtpdebug": true,
        "maintenance": false,
        "theme": "",
        "updater.secret": "***REMOVED SENSITIVE VALUE***"
    }
}
### Client configuration
**Browser:** chrome Versión 75.0.3770.100 (Build oficial) (64 bits)

**Operating system:** windows 10