Support intro
Sorry to hear you’re facing problems. 
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Getting help
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The Basics
- Nextcloud Server version (e.g., 29.x.x):
30.0.25
- Operating system and version (e.g., Ubuntu 24.04):
30.0.25
- Web server and version (e.g, Apache 2.4.25):
nginx 1.29.1
- Reverse proxy and version _(e.g. nginx 1.27.2)
nginx 1.29.1
- PHP version (e.g, 8.3):
8.3.25
- Is this the first time you’ve seen this error? (Yes / No):
Yes
- Installation method (e.g. AlO, NCP, Bare Metal/Archive, etc.)
Docker (nextcloud:30-fpm)
- Are you using CloudfIare, mod_security, or similar? (Yes / No)
No
Summary of the issue you are facing:
Recently I added an event to Nextcloud Calendar. However there were some issues with the event (e.g. when I tried to add a second one it refused to add it and instead insisted on replacing the first one, as they both just have zeroes as the UUID, and it didn’t have and and date and for some reason didn’t let me set one). So, I removed it and instead created an event manually. Then, after a while I got a bounce e-mail from a no-reply who’d sent the event. Looking in my sent folder I then notice that Nextcloud has secretly sent an e-mail falsely claiming I’ve declined the meeting (well actually it said that “Personlig“, the name of the calendar, has declined the meeting). Luckily in this case it just hit a no-reply address and bounced, but this could be pretty bad if Nextcloud cancels a meeting for you and you have no idea it has done so (plus it’s a privacy leak, as it leaks details of your calendar setup, albeit pretty minor).
There is no indication that Nextcloud is going to send any e-mails when removing events from the calendar, and I have been unable to find any settings controlling this. In this case it’s a personal Nextcloud instance where I’m using my own e-mail account, otherwise I wouldn’t even have any way to know this was happening. Deleting the event from the trash apparently causes yet another false decline e-mail. How do you disable this? It really feels like it should be asking for confirmation before sending e-mails to other people.
Configuration
Nextcloud
{
"system": {
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"localhost:8081",
"nextcloud.kvasta.se"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"overwrite.cli.url": "https:\/\/nextcloud.kvasta.se",
"dbtype": "mysql",
"version": "30.0.15.1",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"logtimezone": "UTC",
"installed": true,
"memcache.local": "\\OC\\Memcache\\APCu",
"memcache.locking": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"password": "***REMOVED SENSITIVE VALUE***",
"port": 0
},
"filelocking.enabled": true,
"maintenance": false,
"loglevel": 2,
"theme": "",
"mysql.utf8mb4": true,
"overwriteprotocol": "https",
"trusted_proxies": "***REMOVED SENSITIVE VALUE***",
"apps_paths": [
{
"path": "\/var\/www\/html\/apps",
"url": "\/apps",
"writable": false
},
{
"path": "\/var\/www\/html\/custom_apps",
"url": "\/custom_apps",
"writable": true
}
],
"memcache.distributed": "\\OC\\Memcache\\Redis",
"twofactor_enforced": "false",
"twofactor_enforced_groups": [],
"twofactor_enforced_excluded_groups": [],
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_smtpmode": "smtp",
"mail_sendmailmode": "smtp",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtpsecure": "ssl",
"mail_smtpauthtype": "PLAIN",
"mail_smtpauth": 1,
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "465",
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"session_lifetime": 2592000,
"default_phone_region": "SE",
"maintenance_window_start": 0,
"app_install_overwrite": [
"news"
]
}
}
Apps
Enabled:
- app_api: 4.0.6
- bruteforcesettings: 3.0.0
- calendar: 5.5.4
- cloud_federation_api: 1.13.0
- contacts: 7.3.1
- dashboard: 7.10.0
- dav: 1.31.1
- federatedfilesharing: 1.20.0
- files: 2.2.0
- files_downloadlimit: 3.0.0
- files_reminders: 1.3.0
- files_trashbin: 1.20.1
- gpoddersync: 3.12.0
- logreader: 3.0.0
- lookup_server_connector: 1.18.0
- news: 26.1.0
- notes: 4.12.3
- notifications: 3.0.0
- oauth2: 1.18.1
- provisioning_api: 1.20.0
- recommendations: 3.0.0
- related_resources: 1.5.0
- serverinfo: 2.0.0
- settings: 1.13.0
- survey_client: 2.0.0
- tasks: 0.16.1
- text: 4.1.0
- theming: 2.6.0
- twofactor_backupcodes: 1.19.0
- twofactor_totp: 12.0.0-dev
- viewer: 3.0.0
- webhook_listeners: 1.1.0-dev
- workflowengine: 2.12.0
Disabled:
- activity: 3.0.0 (installed 2.15.0)
- admin_audit: 1.20.0
- breezedark: 29.0.0 (installed 29.0.0)
- circles: 30.0.0 (installed 22.2.0)
- comments: 1.20.1 (installed 1.12.0)
- contactsinteraction: 1.11.0 (installed 1.3.0)
- deck: 1.14.6 (installed 1.14.6)
- drawio: 3.0.9 (installed 3.0.9)
- encryption: 2.18.0
- end_to_end_encryption: 1.16.2 (installed 1.16.2)
- federation: 1.20.0 (installed 1.12.0)
- files_external: 1.22.0 (installed 1.18.0)
- files_markdown: 2.4.1 (installed 2.4.1)
- files_pdfviewer: 3.0.0 (installed 2.7.0)
- files_rightclick: 0.15.1 (installed 1.6.0)
- files_sharing: 1.22.0 (installed 1.20.0)
- files_texteditor: 2.15.1 (installed 2.15.1)
- files_versions: 1.23.0 (installed 1.19.1)
- firstrunwizard: 3.0.0 (installed 2.15.0)
- health: 2.2.2 (installed 2.2.2)
- mail: 5.4.0 (installed 5.4.0)
- nextcloud_announcements: 2.0.0 (installed 1.15.0)
- password_policy: 2.0.0 (installed 1.16.0)
- photos: 3.0.2 (installed 2.2.0)
- privacy: 2.0.0 (installed 1.6.0)
- ransomware_protection: 1.14.0 (installed 1.14.0)
- richdocuments: 8.5.10 (installed 8.5.10)
- richdocumentscode: 25.4.403 (installed 25.4.403)
- sharebymail: 1.20.0 (installed 1.16.0)
- support: 2.0.0 (installed 1.9.0)
- suspicious_login: 8.0.0
- systemtags: 1.20.0 (installed 1.10.0)
- twofactor_nextcloud_notification: 4.0.0
- updatenotification: 1.20.0 (installed 1.16.0)
- user_ldap: 1.21.0
- user_status: 1.10.0 (installed 1.6.0)
- weather_status: 1.10.0 (installed 1.6.0)