Registration Emails not sending

Checklist
[x] I have read intro post: ****
[x ] I have read the tutorials, help and searched for similar issues
[x ] I provide relevant information about my server (component names and versions, etc.)
[x ] I provide a copy of my logs and healthcheck
[x ] I describe the steps I have taken to trouble shoot the problem
[x ] I describe the steps on how to reproduce the issue

Latest version of Passbolt community edition on CentOS 7.
passbolt.php email settings:
// Email configuration.
‘EmailTransport’ => [
‘default’ => [
‘host’ => ‘smtp.mysmtp.net’,
‘port’ => 587,
‘username’ => ‘’,
‘password’ => '
’,
// Is this a secure connection? true if yes, null if no.
‘tls’ => true,
//‘timeout’ => 30,
//‘client’ => null,
//‘url’ => null,
],
],

I can view the mail queue with cake preview. But cake sender --verbose has absolutely no output. The test email does send fine. I have sent it multiple times. The cron job is setup with the nginx user. I see no errors in there and just the EmailQueue.sender command being run.

I have verified all notification emails are configured to be sent out.

[root@passbolt bin]# sudo su -s /bin/bash -c “/var/www/passbolt/bin/cake passbolt healthcheck” nginx

 ____                  __          ____  
/ __ \____  _____ ____/ /_  ____  / / /_ 

/ // / __ `/ / / __ / __ / / _/
/ / // ( |
) /
/ / /
/ / / /
/
/ _
,
/
//./_//__/

Open source password manager for teams

Healthcheck shell

Environment

[PASS] PHP version 7.3.14.
[PASS] PCRE compiled with unicode support.
[PASS] The temporary directory and its content are writable.
[PASS] The public image directory and its content are writable.
[PASS] The logs directory and its content are writable.
[PASS] GD or Imagick extension is installed.
[PASS] Intl extension is installed.
[PASS] Mbstring extension is installed.

Config files

[PASS] The application config file is present
[PASS] The passbolt config file is present

Core config

[PASS] Debug mode is off.
[PASS] Cache is working.
[PASS] Unique value set for security.salt
[PASS] Full base url is set to *****
[PASS] App.fullBaseUrl validation OK.
[PASS] /healthcheck/status is reachable.

SSL Certificate

[FAIL] SSL peer certificate does not validate
[FAIL] Hostname does not match when validating certificates.
[WARN] Using a self-signed certificate
[HELP] cURL Error (60) Peer’s Certificate issuer is not recognized.

Database

[PASS] The application is able to connect to the database
[PASS] 23 tables found
[PASS] Some default content is present
[PASS] The database schema up to date.

GPG Configuration

[PASS] PHP GPG Module is installed and loaded.
[PASS] The environment variable GNUPGHOME is set to /var/lib/nginx/.gnupg.
[PASS] The directory /var/lib/nginx/.gnupg containing the keyring is writable by the webserver user.
[PASS] The server gpg key is not the default one
[PASS] The public key file is defined in config/passbolt.php and readable.
[PASS] The private key file is defined in config/passbolt.php and readable.
[PASS] The server key fingerprint matches the one defined in config/passbolt.php.
[PASS] The server public key defined in the config/passbolt.php (or environment variables) is in the keyring.
[PASS] There is a valid email id defined for the server key.
[PASS] The public key can be used to encrypt a message.
[PASS] The private key can be used to sign a message.
[PASS] The public and private keys can be used to encrypt and sign a message.
[PASS] The private key can be used to decrypt a message.
[PASS] The private key can be used to decrypt and verify a message.
[PASS] The public key can be used to verify a signature.

Application configuration

[PASS] Using latest passbolt version (2.12.0).
[PASS] Passbolt is configured to force SSL use.
[PASS] App.fullBaseUrl is set to HTTPS.
[PASS] Selenium API endpoints are disabled.
[PASS] Search engine robots are told not to index content.
[WARN] Registration is open to everyone.
[HELP] Make sure this instance is not publicly available on the internet.
[HELP] Or set passbolt.registration.public to false in config/passbolt.php.
[PASS] Serving the compiled version of the javascript app
[PASS] All email notifications will be sent.

2 error(s) found. Hang in there!

I have looked in every log file I could find and see absolutely no errors related to failed emails.

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