How To Fix SMTP Error Code 240?

SMTP Error Code 240

Error messages are incomprehensible. The reason behind the SMTP problem depends on the error code. The solution to resolve each error code is also unique. SMTP (Simple Mail Transfer Protocol) is a set of guidelines that allow the email program to transmit email messages over the internet. An SMTP error code is a three-digit code that occurs when there is a communication error. These three codes give information about the problem. The mail server responds to every request your email program makes with a return code. If you see the SMTP error code 240, here are the possible causes of this problem.

  • 1. Third-party antivirus program scans and blocks the SMTP queue folder
  • 2. Enabled self-developed event sink

To resolve the SMTP code 240, carry out the quick troubleshooting steps given on this web page.

Disabling Windows Built-In Antivirus Program

  • Step 1:Navigate to the Start menu on your Windows computer and click Settings -> Update & Security -> Windows Security.
  • Step 2:Select the Virus & threat protection option followed by the Manage Settings option.
  • Step 3:Turn off the ‘Real-time protection’ option.

Third-party Antivirus Program

  • Step 1:If you have already installed any other third-party antivirus program on your computer, try to disable it.

SMTP Event Sink

  • Step 1:As soon as a new Simple Mail Transfer Protocol (SMTP) virtual server is created, event sinks are registered for it automatically.
  • Step 2:Check if there is any NOT-MS event sink.
  • Step 3:Note: You have to disable event sinks that are created by yourself.
  • Step 4:Only automatic event sinks have to be present on SMTP. Because the self-developed event sink might interfere with SMTP and blocks it.
  • Step 5:If you have any doubts in resolving the SMTP error code 240, click the Call button given below. Our technical experts will resolve the queries.

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