[Bug]: NC26.0.0beta2: Email documentation needs to be adapted (or Email setup dialog lacks security settings)

⚠️ This issue respects the following points: ⚠️

[X] This is a bug, not a question or a configuration/webserver/proxy issue.
[X] This issue is not already reported on Github (I've searched it).
[X] Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
[X] Nextcloud Server is running on 64bit capable CPU, PHP and OS.
[X] I agree to follow Nextcloud's Code of Conduct.

Bug description

According to the latest server admin manual, section email_configuration, I should be able to choose Encryption from NONE, SSL/TLS and STARTTLS. I should also be able to choose and set an Authentication method. In my newly installed NC26.0.0beta2 instance, I see that the dialog has changed.

For me, it's unclear what to set. I want STARTTLS. Must I choose "NONE"? If so, will PHP try to use STARTTLS anyway? If so, it should be named "NONE/STARTLS" or "Opportunistic". Else it's a drawback since my server only accepts STARTTLS and setting it to "SSL/TLS" yields an error upon testing. I consider it a drawback anyway since I can no longer enforce encryption using STARTTLS.

Apart from the dialog, the documentation needs to be adapted. Could be worth to also mention it in the NC26 release notes.

NC25: grafik

NC26: grafik

Steps to reproduce

freshly install OR update to NC26.0.0beta2 (I tested both)
open /settings/admin
compare Email settings between NC26 and NC25
compare Email settings between NC26 and latest documentation

Expected behavior

Allow to enforce encryption not only with SSL/TLS but also with STARTTLS (if that's still possible)
Clearify in dialog that STARTLS is being used (if that's what happens)
Don't forget to update the docs :)

Installation method

Community Manual installation with Archive

Operating system

Other

PHP engine version

PHP 8.1

Web server

Nginx

Database engine version

MariaDB

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

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

[X] Default user-backend (database)
[ ] LDAP/ Active Directory
[ ] SSO - SAML
[ ] Other

Configuration report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "stage.selbstbestimmt-digital.de"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "26.0.0.4",
        "overwrite.cli.url": "https:\/\/stage.selbstbestimmt-digital.de",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "updater.release.channel": "beta",
        "installed": true,
        "app_install_overwrite": [
            "twofactor_webauthn"
        ],
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "25"
    }
}

List of activated Apps

Enabled:
  - cloud_federation_api: 1.9.0
  - dav: 1.25.0
  - federatedfilesharing: 1.16.0
  - files: 1.21.1
  - files_rightclick: 1.5.0
  - files_sharing: 1.18.0
  - files_trashbin: 1.16.0
  - logreader: 2.11.0
  - lookup_server_connector: 1.14.0
  - notifications: 2.14.0
  - oauth2: 1.14.0
  - password_policy: 1.16.0
  - provisioning_api: 1.16.0
  - serverinfo: 1.16.0
  - settings: 1.8.0
  - sharebymail: 1.16.0
  - text: 3.7.0
  - theming: 2.1.1
  - twofactor_backupcodes: 1.15.0
  - twofactor_webauthn: 1.0.0
  - updatenotification: 1.16.0
  - viewer: 1.10.0
  - workflowengine: 2.8.0
Disabled:
  - activity: 2.18.0 (installed 2.18.0)
  - admin_audit: 1.16.0
  - bruteforcesettings: 2.6.0
  - circles: 26.0.0-beta2 (installed 26.0.0-beta2)
  - comments: 1.16.0 (installed 1.16.0)
  - contactsinteraction: 1.7.0 (installed 1.7.0)
  - dashboard: 7.6.0 (installed 7.6.0)
  - encryption: 2.14.0
  - federation: 1.16.0 (installed 1.16.0)
  - files_external: 1.18.0
  - files_pdfviewer: 2.7.0 (installed 2.7.0)
  - files_versions: 1.19.1 (installed 1.19.1)
  - firstrunwizard: 2.15.0 (installed 2.15.0)
  - nextcloud_announcements: 1.15.0 (installed 1.15.0)
  - photos: 2.2.0 (installed 2.2.0)
  - privacy: 1.10.0 (installed 1.10.0)
  - recommendations: 1.5.0 (installed 1.5.0)
  - related_resources: 1.1.0-alpha1 (installed 1.1.0-alpha1)
  - support: 1.9.0 (installed 1.9.0)
  - survey_client: 1.14.0 (installed 1.14.0)
  - suspicious_login: 4.4.0
  - systemtags: 1.16.0 (installed 1.16.0)
  - twofactor_totp: 8.0.0-alpha.0
  - user_ldap: 1.16.0
  - user_status: 1.6.0 (installed 1.6.0)
  - weather_status: 1.6.0 (installed 1.6.0)

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

Not relevant.

Additional info

No response

nextcloud / server