Whylidate
Permanent FailureHigh Severity

SMTP Error 550 5.4.1

Recipient Address Rejected

The recipient server rejected the address for relay.

What This Error Means

The receiving mail server refused to accept the message for the specified recipient. This often indicates routing or relay configuration issues.

Common Causes

  • 1Server doesn't accept mail for this domain
  • 2Relay access denied
  • 3Invalid routing configuration
  • 4Domain MX records pointing to wrong server

How to Fix It

  • 1Verify the domain's MX records
  • 2Check if the domain is properly configured
  • 3Contact the domain administrator
  • 4Verify you're sending to the correct address

Prevention with Whylidate

Prevent this error before it happens by validating email addresses with Whylidate. Our real-time verification catches invalid addresses, full mailboxes, and policy issues before you send.

Quick Reference

Error Code
550 5.4.1
Category
Permanent Failure
Severity
High
Should Retry?
No

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