Email Server credentials not accepted

ℹ️ Support
1

Getting this error when attempting to validate email server settings:

image
image1231×394 14.7 KB

Details

Nextcloud version (eg, 20.0.5): 28.0.2
Operating system and version (eg, Ubuntu 20.04): Debian GNU/Linux 12 (bookworm)
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.57 (Debian)
PHP version (eg, 7.4): 8.2.7

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Login as admin, goto Administrator Settings → Basic settings
  2. Enter email server info
  3. Test and verify settings by clicking ‘Send email’

Admin > Logging

Note: These are a few days old, no new entries in log when replicating this issue:

Warning	mail	
Horde_Imap_Client_Exception Too many auth attempts
Could not fetch structure detail data to enhance message previews: Too many auth attempts
Feb 18, 2024, 3:40:02 p.m. 	
Warning	mail	
Horde_Imap_Client_Exception Too many auth attempts
Could not fetch structure detail data to enhance message previews: Too many auth attempts
Feb 18, 2024, 2:35:03 p.m. 	
Error	mail	
Horde_Imap_Client_Exception Mail server denied authentication.
Cron mail sync failed for account 1
Feb 18, 2024, 2:30:34 p.m. 	
Warning	mail	
Horde_Imap_Client_Exception Mail server denied authentication.
Could not fetch structure detail data to enhance message previews: Mail server denied authentication.
Feb 18, 2024, 1:32:36 p.m. 	
Error	PHP	
Error: Class "OCA\DAV\Connector\Sabre\ExceptionLoggerPlugin" not found at /var/www/nextcloud/remote.php#62
Feb 18, 2024, 10:19:12 a.m. 	
Error	mail	
ServiceException Could not set message flag on IMAP: Error when communicating with the mail server.
Could not classify incoming message importance: Could not set message flag on IMAP: Error when communicating with the mail server.
Feb 17, 2024, 1:00:14 p.m. 	
Error	PHP	
Undefined array key 14635 at /var/www/nextcloud/apps/mail/lib/Cache/Cache.php#138
Feb 17, 2024, 10:55:08 a.m. 	
Error	PHP	
Undefined array key 14635 at /var/www/nextcloud/apps/mail/lib/Cache/Cache.php#136
Feb 17, 2024, 10:55:08 a.m. 	
Error	PHP	
Undefined array key 14634 at /var/www/nextcloud/apps/mail/lib/Cache/Cache.php#138
Feb 17, 2024, 10:55:08 a.m.

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

 <?php
$CONFIG = array (
  'instanceid' => 'oc56j8gtqwmy',
  'passwordsalt' => 'xxxxxxxxxxxxxxxxxxxx',
  'secret' => 'xxxxxxxxxxxxxxxxxxxxx',
  'trusted_domains' =>
  array (
    0 => 'xxxxxxxxx',
  ),
  'trusted_proxies' =>
  array (
    0 => '192.168.1.63',
  ),
  'datadirectory' => '/var/www/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '28.0.2.5',
  'overwrite.cli.url' => 'http://nxxx',
  'dbname' => 'nextcloud_db',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextclouduser',
  'dbpassword' => '9KxxxxJBtyqxd-',
  'installed' => true,
  'default_phone_region' => 'CA',
  'default_locale' => 'en_US',
  'filelocking.enabled' => true,
  'memcache.local' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => '/var/run/redis/redis-server.sock',
    'port' => 0,
    'timeout' => 0.0,
  ),
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'log_type' => 'file',
  'logfile' => '/var/www/nextcloud/data/nextcloud.log',
  'loglevel' => 2,
  'maintenance_window_start' => 8,
  'maintenance' => false,
  'theme' => '',
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'app_install_overwrite' =>
 array (
    0 => 'files_texteditor',
    1 => 'keeweb',
    2 => 'memories',
  ),
  'updater.release.channel' => 'stable',
  'memories.exiftool' => '/var/www/nextcloud/apps/memories/bin-ext/exiftool-amd64-glibc',
  'memories.vod.path' => '/var/www/nextcloud/apps/memories/bin-ext/go-vod-amd64',
  'enabledPreviewProviders' =>
  array (
    0 => 'OC\\Preview\\Image',
    1 => 'OC\\Preview\\HEIC',
    2 => 'OC\\Preview\\TIFF',
    3 => 'OC\\Preview\\Movie',
  ),
  'mail_from_address' => 'xxxx',
  'mail_domain' => 'ncf.ca',
  'mail_smtphost' => 'mail.ncf.ca',
  'mail_smtpport' => '993',
  'mail_smtpauth' => 1,
  'mail_smtpname' => 'xxxx',
  'mail_smtppassword' => 'xxxx',
  'mail_smtpsecure' => 'ssl',
  'mail_smtpstreamoptions' =>
   array (
     'ssl' =>
     array (
       'allow_self_signed' => true,
       'verify_peer' => false,
       'verify_peer_name' => false,
     ),
   ),
);

That last bit in the config.php file mail_smtpstreamoptions I added today with no changes in the error.

The NC mail app works fine with the same mail credentials. I was also able to setup a mail account wit Microsoft Outlook with the same credentials so it would appear my mail server is accepting my smtp credentials, or should.

Any help appreciated.

2

Looks like you’re using the wrong port number. Port 993 is normaly used for IMAP over TLS/SSL. Try either port 465 (SSL) or port 587 (None/STARTTLS).

3

Actually my provider recommends TLS encryption with port 587 for the outgoing server. That seems to work. Thanks for your help. I feel a bit embarrassed…

4

Just between you and me. I googled it before I replied to make sure I got it right. And after googling it and reading IMAPS, my first thought was: hmm, SSL, IMAPS, looks good, it must be something else, and it was only after scrolling through the logs in your post, googling a few messages and then looking at the screenshot again and googling the port again that I realised: oops! One of the SMTP ports would probably be better suited for sending emails :wink: