External mail addresses are being cached

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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:

example

Or for longer, use three backticks above and below the code snippet:

longer
example
here

Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can :heart:

Nextcloud version (eg, 12.0.2): 17.0.1
Operating system and version (eg, Ubuntu 17.04): 18.04 LTS
Apache or nginx version (eg, Apache 2.4.25): latest
PHP version (eg, 7.1): 7.2

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N): No

Steps to replicate it:

  1. When I try to share a Folder with an “external” mail addresses it will be populated to other in the nextcloud.
  2. I don’t wnt to have nextcloud autocompletimg the mail adresse of external
  3. How can I block this

The output of your Nextcloud log in Admin > Logging:

PASTE HERE

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

<?php
$CONFIG = array (
  'passwordsalt' => 'greatpassword',
  'secret' => 'somesecret',
  'trusted_domains' =>
  array (
    1 => 'nextcloud',
    2 => 'nextcloud.somedomain.com',
  ),
  'datadirectory' => '/opt/data',
  'tempdirectory' => '/opt/data/upload-temp',
  'dbtype' => 'pgsql',
  'version' => '17.0.1.1',
  'overwrite.cli.url' => 'https://nextcloud.somedomain.com',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost:9999',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'ncdb',
  'dbpassword' => 'somesecret',
  'installed' => true,
  'instanceid' => 'fkhwklfhwlkf',
  'maintenance' => false,
  'default_language' => 'de',
  'default_locale' => 'de_DE',
  'session_lifetime' => 900,
  'remember_login_cookie_lifetime' => 0,
  'session_keepalive' => false,
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'mail_from_address' => 'somemail',
  'mail_domain' => 'somedomain.com',
  'mail_smtpdebug' => true,
  'enable_previews' => false,
  'overwriteprotocol' => 'https',
  'trashbin_retention_obligation' => '7, 8',
  'loglevel' => 0,
  'logdateformat' => 'F d, Y H:i:s',
  'logfilemode' => 416,
  'log_type' => 'file',
  'logfile' => '/var/log/nextcloud/nextcloud.log',
  'mail_smtphost' => 'somedomain.somedomain.com',
  'mail_smtpport' => 'someport',

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

PASTE HERE