Troubleshooting SMTP Responses

Troubleshooting SMTP Response 250

What causes SMTP 250 response and how do you fix it? SMTP code 250 indicates a successful action.

What causes the 250 SMTP response

SMTP code 250 indicates a successful action. The receiving server returns this response code when it has successfully processed an SMTP command. After successful receipt of an email message the SMTP server will also return 250 OK.

The SMTP Client often receives additional information at the end of a successful email transmission. This additional content will contain information such as an acknowledgment of receipt, a queue identifier or a message identifier.

SMTP 250 response explained

Let's break down the SMTP 250 response code into it's parts:

2 The first digit of the SMTP 250 indicates whether the response is good, bad or incomplete. 2xx Positive Completion.
5 The second digit of the SMTP 250 indicates the response category. x5x replies generally indicate the status of the mail system or mail server status.
0 The third digit of the SMTP 250 indicates the specific response. While not always true, 0 tends to be a generic response and other numbers are more specific.

SMTP 250 response code examples

  • 250 2.0.0 OK
  • 250 2.0.0 OK [ID] [Server details] - gsmtp
  • 250 2.0.0 Ok: queued as [Queue ID]
  • 250 2.1.5 Recipient OK
  • 250 OK id=[Message ID]
  • 250 ok: Message [Message Number] accepted
  • 250 Great success

What causes the SMTP 250 response?

  • Successful email transmission.
  • Successful command execution in the SMTP conversation.

How do you fix an SMTP 250 response?

For a 250 SMTP response code:

  • No action is typically required as this code indicates successful processing.
  • You may review the details or identifiers included in the response for record-keeping or further processing needs.
  • Ensure to monitor subsequent responses if part of a multi-command SMTP sequence to confirm the completion of the entire transaction.

Need help sending or receiving transactional email? Contact CloudMailin Support to see if we can provide a more reliable SMTP service.

Other SMTP Responses

Troubleshoot other SMTP responses using the links below: