Calendar doesn't send e-mail

[abachtold]

Steps to reproduce

1. Invite people without a account for an event in the calendar. So that they can accept the invite.

Expected behaviour

People receive an e-mail with the invite. If they could answer "I'll go" or anything like that

Actual behaviour

It sends to people registered on my nextcloud but doesn't for people outside of it. And my SMTP configuration is working.

Calendar app

Calendar 2.3.4

Client configuration

Browser:
Firefox 94.0.1

Operating system:
Windows 10

Server configuration

Operating system:
Debian 10 - Buster

Web server:
Nginx

Database:
MariaDB

PHP version:
7.3.31-1

Nextcloud Version: 22.2.0
Fresh

List of activated apps:

`Enabled:

• accessibility: 1.8.0
• activity: 2.15.0
• apporder: 0.13.0
• audioplayer: 3.2.2
• bruteforcesettings: 2.2.0
• calendar: 2.3.4
• checksum: 1.1.2
• circles: 22.1.1
• cloud_federation_api: 1.5.0
• comments: 1.12.0
• contacts: 4.0.6
• contactsinteraction: 1.3.0
• dashboard: 7.2.0
• dav: 1.19.0
• encryption: 2.10.0
• event_update_notification: 1.3.0
• extract: 1.3.2
• federatedfilesharing: 1.12.0
• federation: 1.12.0
• files: 1.17.0
• files_pdfviewer: 2.3.1
• files_retention: 1.11.1
• files_rightclick: 1.1.0
• files_sharing: 1.14.0
• files_trashbin: 1.12.0
• files_versions: 1.15.0
• files_videoplayer: 1.11.0
• groupfolders: 10.0.0
• integration_openproject: 1.0.6
• logreader: 2.7.0
• lookup_server_connector: 1.10.0
• metadata: 0.14.0
• nextcloud_announcements: 1.11.0
• notifications: 2.10.1
• oauth2: 1.10.0
• onlyoffice: 7.2.0
• password_policy: 1.12.0
• photos: 1.4.0
• printer: 0.0.5
• privacy: 1.6.0
• provisioning_api: 1.12.0
• quota_warning: 1.11.0
• rainloop: 7.1.2
• ransomware_protection: 1.11.0
• recommendations: 1.1.0
• serverinfo: 1.12.0
• settings: 1.4.0
• sharebymail: 1.12.0
• sharerenamer: 2.7.3
• side_menu: 2.0.1
• spreed: 12.1.2
• support: 1.5.0
• survey_client: 1.10.0
• suspicious_login: 4.0.0
• systemtags: 1.12.0
• text: 3.3.0
• theming: 1.13.0
• theming_customcss: 1.10.0
• twofactor_backupcodes: 1.11.0
• twofactor_totp: 6.1.0
• updatenotification: 1.12.0
• user_status: 1.2.0
• viewer: 1.6.0
• weather_status: 1.2.0
• whiteboard: 0.0.3
• workflowengine: 2.4.0
  Disabled:
• admin_audit
• appointments
• breezedark
• dropit
• epubreader
• files_clipboard
• files_external
• firstrunwizard
• mail
• notes
• quicknotes
• tasks
• timemanager
• user_ldap
  `

Nextcloud configuration:

    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
                   ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "22.2.3.0",
        "overwrite.cli.url": ,
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "app_install_overwrite": [
            "appointments",
            "quicknotes",
            "files_reader",
            "apporder",
            "epubreader",
            "printer",
            "whiteboard",
            "dropit",
            "files_clipboard",
            "bruteforcesettings",
            "rainloop",
            "sharerenamer",
            "breezedark"
        ],
        "default_language": "pt_BR",
        "default_locale": "pt_BR",
        "default_phone_region": "BR",
        "maintenance": false,
        "simpleSignUpLink.shown": false,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpsecure": "tls",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpauth": 1,
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "knowledgebaseenabled": false,
        "theme": "",
        "loglevel": 2,
        "trashbin_retention_obligation": "auto, 30",
        "twofactor_enforced": "false",
        "twofactor_enforced_groups": [],
        "twofactor_enforced_excluded_groups": [
            "admin"
        ],
        "updater.secret": "***REMOVED SENSITIVE VALUE***"
    }

[tcitworld]

Possibly a regression related to nextcloud/server#28997 ? @miaulalala @st3iny

[miaulalala]

Maybe. @abachtold are you using gmail for your smtp config perchance?

[ModestTG]

I think this might be a problem simply with gmail. I am having the same issues (details in #3680) where the calendar invite is not being sent, but this appears to be, in my testing, only when sending emails to individuals at gmail potentially. When I try, I am getting dmarc reports from Google. I tested creating an event and sending to a different domain and was able to receive the invite fine. I have my own SMTP server for sending the email. I am not using gmail for SMTP.

I haven't tested sending to other major domains (hotmail.com, yahoo.com, any corporate tld), but hopefully this insight is helpful. Since almost everyone in my contacts list uses gmail, I currently have no way to send out invites to my contacts.

[abachtold]

Sorry for the long delay in my response.
I'm using gmail for my SMTP.
I didn't think of it because it works for the system e-mails, but I'll make a SMTP server and try changing the configuration to test that.
Thanks.