[Bug]: Email could not be sent

⚠️ 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

A problem occurred while sending the email. Please revise your settings. (Error: Email could not be sent. Check your mail server log).

Share notification mail also could not be sent.
When sharing file, the following message in logging:

When i send mail from the server using command
sendemail -f mail_from@.com -t mail_to@.com -u subject -m "message" -s mail_server.com:25
mail comes

Steps to reproduce

When configuring the mail server, when you click send mail, an error occurs.

Expected behavior

Mail must be sent.

Installation method

Community Manual installation with Archive

Nextcloud Server version

27

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.1

Web server

Apache (supported)

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?

Encryption is Disabled

What user-backends are you using?

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": [
            "*****.****"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "27.0.2.1",
        "overwrite.cli.url": "http:\/\/******.****",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "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",
        "mail_smtpdebug": true,
        "ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory",
        "maintenance": false
    }
}

List of activated Apps

Enabled:
  - activity: 2.19.0
  - admin_audit: 1.17.0
  - announcementcenter: 6.6.2
  - calendar: 4.4.4
  - circles: 27.0.1
  - cloud_federation_api: 1.10.0
  - comments: 1.17.0
  - contacts: 5.3.2
  - contactsinteraction: 1.8.0
  - dashboard: 7.7.0
  - dav: 1.27.0
  - drawio: 2.1.2
  - federatedfilesharing: 1.17.0
  - federation: 1.17.0
  - files: 1.22.0
  - files_pdfviewer: 2.8.0
  - files_rightclick: 1.6.0
  - files_sharing: 1.19.0
  - files_trashbin: 1.17.0
  - files_versions: 1.20.0
  - firstrunwizard: 2.16.0
  - impersonate: 1.14.0
  - logreader: 2.12.0
  - lookup_server_connector: 1.15.0
  - mail: 3.3.1
  - nextcloud_announcements: 1.16.0
  - notes: 4.8.1
  - notifications: 2.15.0
  - oauth2: 1.15.1
  - officeonline: 2.0.2
  - password_policy: 1.17.0
  - photos: 2.3.0
  - privacy: 1.11.0
  - provisioning_api: 1.17.0
  - recommendations: 1.6.0
  - related_resources: 1.2.0
  - serverinfo: 1.17.0
  - settings: 1.9.0
  - sharebymail: 1.17.0
  - spreed: 17.0.3
  - support: 1.10.0
  - survey_client: 1.15.0
  - systemtags: 1.17.0
  - text: 3.8.0
  - theming: 2.2.0
  - twofactor_backupcodes: 1.16.0
  - updatenotification: 1.17.0
  - user_ldap: 1.17.0
  - user_status: 1.7.0
  - viewer: 2.1.0
  - weather_status: 1.7.0
  - workflowengine: 2.9.0
Disabled:
  - bruteforcesettings: 2.7.0
  - encryption: 2.15.0
  - files_external: 1.19.0
  - suspicious_login: 5.0.0
  - twofactor_totp: 9.0.0

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

{"reqId":"dXme5veE6SxR08Pe9xx1","level":3,"time":"2023-08-28T08:19:38+00:00","remoteAddr":"**.**.***.***","user":"administrator","app":"no app in context","method":"POST","url":"/ocs/v2.php/apps/files_sharing/api/v1/shares","message":"Share notification mail could not be sent to: ******@****","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36","version":"27.0.2.1","data":[]}

Additional info

No response

Did you check the mail server log?

The relevant change from 25 to 27 is that we replaced Swift Mailer with Symfony Mailer.

Please check the other issues for troubleshooting tips:

#37329
#37694
#38957
#39452
#39538

Did you check the mail server log?

There are no entries from nextcloud in the mail server logs

I see you enabled mail_smtpdebug. Unfortunately, in order to see the output of that you also need to set your loglevel to 0 in your config.php currently:

'loglevel' => 0,

Be cautious enabling this since it'll apply to everything occurring on your NC instance, not just email.

The following message apeared ater enabling 'loglevel' => 0,

{
  "reqId": "bB28tbjqiCQ0AGP4C030",
  "level": 0,
  "time": "2023-08-28T16:15:30+00:00",
  "remoteAddr": "ip_addr",
  "user": "administrator",
  "app": "core",
  "method": "POST",
  "url": "/index.php/settings/admin/mailtest",
  "message": "Sending mail to \"Array\n(\n    [test@com] => administrator\n)\n\" with subject \"Email setting test\" failed",
  "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36",
  "version": "27.0.2.1",
  "exception": {
    "Exception": "Symfony\\Component\\Mailer\\Exception\\TransportException",
    "Message": "Unable to connect with STARTTLS: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages:\nerror:0A000086:SSL routines::certificate verify failed",
    "Code": 0,
    "Trace": [
      {
        "function": "Symfony\\Component\\Mailer\\Transport\\Smtp\\Stream\\{closure}",
        "class": "Symfony\\Component\\Mailer\\Transport\\Smtp\\Stream\\SocketStream",
        "type": "->",
        "args": [
          "*** sensitive parameters replaced ***"
        ]
      },
      {
        "file": "/var/www/html/nextcloud/3rdparty/symfony/mailer/Transport/Smtp/Stream/SocketStream.php",
        "line": 174,
        "function": "stream_socket_enable_crypto"
      },
      {
        "file": "/var/www/html/nextcloud/3rdparty/symfony/mailer/Transport/Smtp/EsmtpTransport.php",
        "line": 115,
        "function": "startTLS",
        "class": "Symfony\\Component\\Mailer\\Transport\\Smtp\\Stream\\SocketStream",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/3rdparty/symfony/mailer/Transport/Smtp/SmtpTransport.php",
        "line": 253,
        "function": "doHeloCommand",
        "class": "Symfony\\Component\\Mailer\\Transport\\Smtp\\EsmtpTransport",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/3rdparty/symfony/mailer/Transport/Smtp/SmtpTransport.php",
        "line": 194,
        "function": "start",
        "class": "Symfony\\Component\\Mailer\\Transport\\Smtp\\SmtpTransport",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/3rdparty/symfony/mailer/Transport/AbstractTransport.php",
        "line": 72,
        "function": "doSend",
        "class": "Symfony\\Component\\Mailer\\Transport\\Smtp\\SmtpTransport",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/3rdparty/symfony/mailer/Transport/Smtp/SmtpTransport.php",
        "line": 136,
        "function": "send",
        "class": "Symfony\\Component\\Mailer\\Transport\\AbstractTransport",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/3rdparty/symfony/mailer/Mailer.php",
        "line": 45,
        "function": "send",
        "class": "Symfony\\Component\\Mailer\\Transport\\Smtp\\SmtpTransport",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/lib/private/Mail/Mailer.php",
        "line": 216,
        "function": "send",
        "class": "Symfony\\Component\\Mailer\\Mailer",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/apps/settings/lib/Controller/MailSettingsController.php",
        "line": 168,
        "function": "send",
        "class": "OC\\Mail\\Mailer",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php",
        "line": 230,
        "function": "sendTestMail",
        "class": "OCA\\Settings\\Controller\\MailSettingsController",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php",
        "line": 137,
        "function": "executeController",
        "class": "OC\\AppFramework\\Http\\Dispatcher",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/lib/private/AppFramework/App.php",
        "line": 183,
        "function": "dispatch",
        "class": "OC\\AppFramework\\Http\\Dispatcher",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/lib/private/Route/Router.php",
        "line": 315,
        "function": "main",
        "class": "OC\\AppFramework\\App",
        "type": "::"
      },
      {
        "file": "/var/www/html/nextcloud/lib/base.php",
        "line": 1071,
        "function": "match",
        "class": "OC\\Route\\Router",
        "type": "->"
      },
      {
        "file": "/var/www/html/nextcloud/index.php",
        "line": 36,
        "function": "handleRequest",
        "class": "OC",
        "type": "::"
      }
    ],
    "File": "/var/www/html/nextcloud/3rdparty/symfony/mailer/Transport/Smtp/Stream/SocketStream.php",
    "Line": 171,
    "message": "Sending mail to \"Array\n(\n    [test@com] => administrator\n)\n\" with subject \"Email setting test\" failed",
    "exception": {},
    "CustomMessage": "Sending mail to \"Array\n(\n    [test@com] => administrator\n)\n\" with subject \"Email setting test\" failed"
  }
}

See #40073 (comment) as there are 99% chances fix is there.

Unable to connect with STARTTLS: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages:\nerror:0A000086:SSL routines::certificate verify failed

https://docs.nextcloud.com/server/latest/admin_manual/configuration_server/email_configuration.html#troubleshooting and look for "To disable peer verification".

We are also affected from this issue on NC 27.1.0.

We use a local MTA (exim4, listing on Port 25), which send the to our internal mail relay. There are following error entries in den exim log:
TLS error on connection from localhost [127.0.0.1] (gnutls_handshake): Decryption has failed.

Most likely, your certificate is not valid for localhost / 127.0.0.1.

This issue has been automatically marked as stale because it has not had recent activity and seems to be missing some essential information. It will be closed if no further activity occurs. Thank you for your contributions.

@kesselb

@kesselb yes, but we use (unencrypted) port 25, since it's an internal mailrelay. it seems that Nextcloud ignores the the "NO"-Encryption setting.

@ZID-TU-Graz #37329 (comment)

As written before, we migrated our SMTP library from SwiftMailer to Symfony Mailer.
Symfony Mailer tries to use StartTLS when announced, it's not possible to opt out.

Please check the other issues for troubleshooting tips:

#37329
#37694
#38957
#39452
#39538

@kesselb

thank you for the info @kesselb

@ZID-TU-Graz you are welcome, if you need further assistance, please reach out via support.

thank you, i tryed evrething but not the ipv6 that got online, thank you this helped alot, just did this and worked i even rebuilt the mailcow and nextcloud jesus i'm stupid.

if you ping your mail.domain.x and brings back ipv6 and your network mainly works on ipv4 do this and it will work:

Edit /etc/default/grub and append ipv6.disable=1 to GRUB_CMDLINE_LINUX and GRUB_CMDLINE_LINUX_DEFAULT like the following sample:

FROM:

GRUB_CMDLINE_LINUX_DEFAULT=""
GRUB_CMDLINE_LINUX=""
TO:

GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1"
GRUB_CMDLINE_LINUX="ipv6.disable=1"

reboot and it will start work

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[Bug]: Email could not be sent #40073

⚠️ This issue respects the following points: ⚠️

Bug description

Steps to reproduce

Expected behavior

Installation method

Nextcloud Server version

Operating system

PHP engine version

Web server

Database engine version

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

Are you using the Nextcloud Server Encryption module?

What user-backends are you using?

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

[Bug]: Email could not be sent #40073

Description

⚠️ This issue respects the following points: ⚠️

Bug description

Steps to reproduce

Expected behavior

Installation method

Nextcloud Server version

Operating system

PHP engine version

Web server

Database engine version

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

Are you using the Nextcloud Server Encryption module?

What user-backends are you using?

Configuration report

List of activated Apps

Nextcloud Signing status

Nextcloud Logs

Additional info

Activity

kesselb commented on Aug 28, 2023

kesselb commented on Aug 28, 2023

ETararenko commented on Aug 28, 2023

joshtrichards commented on Aug 28, 2023

ETararenko commented on Aug 28, 2023

solracsf commented on Aug 28, 2023

kesselb commented on Aug 28, 2023

ZID-TU-Graz-Collab commented on Sep 22, 2023

kesselb commented on Sep 22, 2023

nextcloud-command commented on Oct 23, 2023

ZID-TU-Graz-Collab commented on Oct 31, 2023

kesselb commented on Oct 31, 2023

kesselb commented on Oct 31, 2023

ZID-TU-Graz-Collab commented on Oct 31, 2023

kesselb commented on Oct 31, 2023

AlissonSantos95 commented on Jan 29, 2024

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

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