[Bug]: sendmail option in basic setting vanished

[ahcm]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

Hi,

we are using the nextcloud snap and just noticed that emails do not go out anymore.
Checking basic settings the option to select sendmail vanished.

But as you can see sendmail used to be working:

$ nextcloud.occ config:list | grep mail
"mail_from_address": "REMOVED SENSITIVE VALUE",
"mail_smtpmode": "smtp",
"mail_sendmailmode": "smtp",
"mail_domain": "REMOVED SENSITIVE VALUE",
"emailTestSuccessful": "1",

Now it is not selectable in basic settings and does not work anymore.
sendmail (provided by postfix) is still available on the system and nothing besides system updates changed.

Best
Andreas

Steps to reproduce

Expected behavior

sendmail being selectable and working.

Nextcloud Server version

30

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

MySQL

Is this bug present after an update or on a fresh install?

Upgraded to a MAJOR version (ex. 31 to 32)

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

{
    "system": {
        "apps_paths": [
            {
                "path": "\/snap\/nextcloud\/current\/htdocs\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/snap\/nextcloud\/current\/nextcloud\/extra-apps",
                "url": "\/extra-apps",
                "writable": true
            }
        ],
        "supportedDatabases": [
            "mysql"
        ],
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.local": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0
        },
        "log_type": "file",
        "logfile": "\/var\/snap\/nextcloud\/current\/logs\/nextcloud.log",
        "logfilemode": 416,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "***REMOVED SENSITIVE VALUE***"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "30.0.5.1",
        "overwrite.cli.url": "https:\/\/***REMOVED SENSITIVE VALUE***",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "maintenance": false,
        "overwritehost": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "overwriteprotocol": "https",
        "app_install_overwrite": [
            "files_markdown",
            "files_readmemd"
        ],
        "loglevel": 2,
        "theme": "",
        "maintenance_window_start": 1,
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***"
    }
}

List of activated Apps

Enabled:                                                                                                                                                        [22/1937]
  - activity: 3.0.0
  - app_api: 4.0.5
  - bruteforcesettings: 3.0.0
  - calendar: 5.0.9
  - checksum: 1.2.5
  - circles: 30.0.0
  - cloud_federation_api: 1.13.0
  - comments: 1.20.1
  - contactsinteraction: 1.11.0
  - dav: 1.31.1
  - event_update_notification: 2.5.0
  - external: 5.5.2
  - federatedfilesharing: 1.20.0
  - files: 2.2.0
  - files_downloadlimit: 3.0.0
  - files_external: 1.22.0
  - files_markdown: 2.4.1
  - files_pdfviewer: 3.0.0
  - files_readmemd: 3.0.2
  - files_reminders: 1.3.0
  - files_sharing: 1.22.0
  - files_trashbin: 1.20.1
  - files_versions: 1.23.0
  - groupfolders: 18.0.9
  - logreader: 3.0.0
  - lookup_server_connector: 1.18.0
  - nextcloud_announcements: 2.0.0
  - notifications: 3.0.0
  - oauth2: 1.18.1
  - password_policy: 2.0.0
  - polls: 7.2.9
  - privacy: 2.0.0
  - provisioning_api: 1.20.0
  - quota_warning: 1.20.0
  - recommendations: 3.0.0
  - related_resources: 1.5.0
  - richdocuments: 8.5.3
  - richdocumentscode: 24.4.1103
  - serverinfo: 2.0.0
  - settings: 1.13.0
  - sharebymail: 1.20.0
  - systemtags: 1.20.0
  - text: 4.1.0
  - theming: 2.5.0
  - twofactor_backupcodes: 1.19.0
  - viewer: 3.0.0
  - webhook_listeners: 1.1.0-dev
  - workflowengine: 2.12.0
Disabled:
  - admin_audit: 1.20.0
  - bbb: 2.7.3 (installed 2.7.3)
  - dashboard: 7.10.0 (installed 7.5.0)
  - dicomviewer: 2.3.0 (installed 2.3.0)
  - electronicsignatures: 3.0.4 (installed 3.0.4)
  - encryption: 2.18.0
  - federation: 1.20.0 (installed 1.15.0)
  - files_downloadactivity: 1.17.0 (installed 1.17.0)
  - files_rightclick: 0.15.1 (installed 1.6.0)
  - firstrunwizard: 3.0.0 (installed 2.14.0)
  - pandoc: 0.7.0 (installed 0.7.0)
  - photos: 3.0.2 (installed 2.0.1)
  - support: 2.0.0 (installed 1.8.0)
  - survey_client: 2.0.0 (installed 1.13.0)
  - suspicious_login: 8.0.0
  - twofactor_nextcloud_notification: 4.0.0
  - twofactor_totp: 12.0.0-dev
  - user_ldap: 1.21.0
  - user_status: 1.10.0 (installed 1.5.0)
  - weather_status: 1.10.0 (installed 1.5.0)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

empty

Additional info

No response

[susnux]

Should be fixed with 30.0.7 by #46480