NC18 reminder via mail not working

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Nextcloud version (eg, 18.0.2): 18.0.4
Operating system and version (eg, Ubuntu 20.04): Linux 3.10.0-962.3.2.lve1.5.26.7.el7.x86_64 #1 SMP Wed Oct 2 07:53:12 EDT 2019 x86_64
Apache or nginx version (eg, Apache 2.4.25): shared host, I guess Apache
PHP version (eg, 7.1): 7.3.18

The issue you are facing: No mail received

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. created calendar entry
  2. added reminder for June 1st, 2020 with duration every year, at same date. Added time, wehen mail should be sent.
  3. Can see entry in calendar with provided details

The output of your Nextcloud log in Admin > Logging:

no entry 

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

    "instanceid": "***REMOVED SENSITIVE VALUE***",
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
        "cloud.domain.de"
    ],
    "datadirectory": "***REMOVED SENSITIVE VALUE***",
    "dbtype": "mysql",
    "version": "18.0.4.2",
    "overwrite.cli.url": "https:\/\/cloud.domain.de",
    "dbname": "***REMOVED SENSITIVE VALUE***",
    "dbhost": "***REMOVED SENSITIVE VALUE***",
    "dbport": "",
    "dbtableprefix": "oc_",
    "dbuser": "***REMOVED SENSITIVE VALUE***",
    "dbpassword": "***REMOVED SENSITIVE VALUE***",
    "installed": true,
    "memcache.local": "\\OC\\Memcache\\APCu",
    "mail_smtpmode": "smtp",
    "mail_smtpsecure": "ssl",
    "mail_sendmailmode": "smtp",
    "mail_from_address": "***REMOVED SENSITIVE VALUE***",
    "mail_domain": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpauthtype": "LOGIN",
    "mail_smtpauth": 1,
    "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
    "mail_smtpport": "465",
    "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
    "mail_smtppassword": "***REMOVED SENSITIVE VALUE***"

The output of your Apache/nginx/system log in /var/log/____:

Shared host, no access

Any idea why this is not working? Checked spam folder, but could not find it there neither.

Kind regards
//neph

Anyone else who is facing this issue?

Kind regards
//neph