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Error :”551 5.1.1 recipient is not exist”

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Introduction

When sending outbound emails, you may receive a bounce-back error indicating that the recipient address is invalid or not found. A typical example of this error is:

Error:

A message that you sent could not be delivered to one or more of its recipients.
This is a permanent error. The following address(es) failed:

SMTP error from remote mail server after RCPT TO:<recipient@example.com>:
551 5.1.1 recipient does not exist

This error occurs because the recipient’s email address is not recognized by the destination mail server.

Prerequisites

  • Basic Email Knowledge: Understand how to identify and verify email addresses.

Step-by-Step Guide

Step 1: Identify the Error

This error usually means the recipient’s email address is invalid, misspelled, or no longer exists on the destination mail server.

Common causes include:

  • Typo in the email address (e.g., john.doe@exampl.com instead of john.doe@example.com)
  • The recipient account has been deleted or is inactive
Step 2: Suggested Solutions
  • Verify the Email Address: Ensure that the recipient address is spelled correctly and still valid.
  • Contact the Recipient: If possible, ask the intended recipient to confirm their current email address.

Conclusion

The error 551 5.1.1 recipient does not exist   indicates that the destination server cannot locate the specified email address. Always double-check the address and reach out to the recipient if needed.

For further assistance, please contact our support team at support@ipserverone.com.

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