Can READ emails, cannot SEND emails (but can send from mail client and phpmailer

[jobst]

I have an email client (thunderbird), I can connect to the mailserver, read and send emails - no problem.

Using Roundcube I can READ emails (IMAPS) but I cannot send emails.

PHP: 8.2
sendmail: 8.16.1-11.el9
saslauth: 2.1.27-21.el9
OS: Almalinux 9.4

This is a MULTI IP ADDRESS host, so I cannot bind the ssl (465) port to localhost, it needs to be IP address based.

From the commandline I can telnet into the IPADDRESS, no problem: telnet 139.99.189.91 465
[~] #>telnet 139.99.189.91 465
Trying 139.99.189.91...
Connected to 139.99.189.91.
Escape character is '^]'.

Using PHPMailer I can send an email using the SAME mailserver using the USER running the server.
$mail = new PHPMailer(true);
try
{
  $mail->SMTPDebug = 4;
  $mail->isSMTP();
  $mail->Host = '139.99.189.91';
  $mail->SMTPAuth = true;                                                                                                                                                           
  $mail->Username = 'XXXXXXXXXXXXXXXX';
  $mail->Password = 'YYYYYYYYYYYYYYYY';                                                                                                                                           
  $mail->SMTPSecure = 'ssl';
  $mail->Port = 465;
  // because I am using IP and NOT hostname
  $mail->SMTPOptions = array(
    'ssl' => array(
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    )
  );

ERRORMESSAGE (no matter the setting)
[13-Aug-2024 17:34:57 +1000]: PHP Error: Failed to connect socket:  (POST /votWebMail/?_task=mail&_unlock=loading1723534497509&_framed=1&_action=send)
[13-Aug-2024 17:34:57 +1000]: SMTP Error: Connection failed:  (Code: -1) in /PATH/program/lib/Roundcube/rcube.php on line 1794 (POST /votWebMail/?_task=mail&_unlock=loading1723534497509&_framed=1&_action=send)

My config (well the current one, I tried many).
$config['smtp_server']    = 'ssl://139.99.189.91';                                                                                                                                                                                         
$config['smtp_port']      = 465;
$config['smtp_user']      = '%u';
$config['smtp_pass']      = '%p';
$config['smtp_auth_type'] = null;
$config['smtp_auth_cid']  = null;
$config['smtp_auth_pw']  = null;


DOnt know what's wrong.
Help please!

[JohnDoh]

Its the same as this

// because I am using IP and NOT hostname
$mail->SMTPOptions = array(
  'ssl' => array(
      'verify_peer' => false,
      'verify_peer_name' => false,
      'allow_self_signed' => true
  )
);

Have a look at this FAQ. Just like in your PHPMailer example you need to use the `smtp_conn_options` Roundcube config setting to disable the certificate verification.

Also with the release of 1.6 the smtp_host and smtp_port config options were retired and replaced with smtp_host. 1.6 release notes

[jobst]

I am really sorry, I forgot to append this, I already have this in the config file:
$config['smtp_conn_options'] = array(
  'ssl' => array(
    'verify_peer'  => false,
  ),
);

I also have this now:
$config['smtp_host']      = 'ssl://139.99.189.91:465';
$config['smtp_user']      = '%u';
$config['smtp_pass']      = '%p';
$config['smtp_auth_type'] = null;
$config['smtp_auth_cid']  = null;
$config['smtp_auth_pw']   = null;

The error message is now
[14-Aug-2024 09:29:28 +1000]: <nm8r1njo> PHP Error: Failed to connect socket:  (POST /votWebMail/?_task=mail&_unlock=loading1723591767596&_framed=1&_action=send)
[14-Aug-2024 09:29:28 +1000]: <nm8r1njo> SMTP Error: Connection failed:  (Code: -1) in PATH/program/lib/Roundcube/rcube.php on line 1794 (POST /votWebMail/?_task=mail&_unlock=loading1723591767596&_framed=1&_action=send)