[Custom SMTP Email Server] - Outlook365 Error `432 4.3.2 STOREDRV.ClientSubmit; Sender Thread Limit Exceeded`

Question: As of version 7.3, If you're using Outlook365 (not on-prem) as your SMTP server, you might encounter the following error when sending batch emails:

Essentially, this error is thrown back from the SMTP server telling us that we've opened too many simultaneous connections which exceeds the limit (3) of the server.

 

Solution: The reporting engine utilizes nodeMailer to send out emails. Its transport is configurable so what we'd need to do is limit the number of connections it opens and utilize a pooled connection.

 

To change these settings:

1) Create a backup of the file 

C:\Program Files\Sisense\app\galaxy-service\src\features\emails\v1\mailSender.js​

 

2) Open the original and modify the following object:

 

function getSmtpTransport( ){
...
return mailer.createTransport( {
  maxConnections: 3, //<-----------ADD THIS LINE
  pool: true,        //<-----------ADD THIS LINE
  host: emailServerConfig.host || 'localhost',
  port: emailServerConfig.port || 465,
  secure: emailServerConfig.secure || false,
  ignoreTLS: emailServerConfig.ignoreTLS || false,
  requireTLS: emailServerConfig.requireTLS || false,
  connectionTimeout: emailServerConfig.connectionTimeout || 10000,
  greetingTimeout: emailServerConfig.greetingTimeout || 5000,
  socketTimeout: emailServerConfig.socketTimeout || 5000,
  logger: emailServerConfig.logger || false,
  debug: emailServerConfig.debug || false,
  auth: auth
   } );
}

3) Restart Sisense.Galaxy service.

 

If that does not help you please create a support ticket and our support agents would be happy to help.

 

Sources:
https://nodemailer.com/smtp/pooled/