Recipient account disabled
The recipient account is likely inactive or suspended.
What to do now
- Check that the recipient address is correct.
- Contact the recipient another way to confirm the account state and whether it can be restored.
Representative reply
550 5.2.1 Mailbox is disabled
Retry decision
Resend after the account is restored.
Why it happens
The account may be suspended or disabled by an administrator.
Typical stage
RCPT TO
- CONNECT
- EHLO
- MAIL FROM
- RCPT TO
- DATA
- DELIVERY
Stages vary by server. Confirm the actual stage from the complete reply and session logs.
What is SMTP Reply Code?Open only the explanations you need
Three-digit server reply: 4xx is transient, 5xx permanent. Read the complete text to investigate the cause.
What is Enhanced Status Code?Open only the explanations you need
An extended status such as 5.1.1. Server wording and usage may vary.
What is RCPT TO?Open only the explanations you need
SMTP command identifying a recipient.
Check directly
- Check that the recipient address is correct.
- Contact the recipient another way to confirm the account state and whether it can be restored.
If you operate or diagnose the mail server, the tools below can help with these checks.
Cautions
Observed DSNs do not map one-to-one to causes. The stage shown is typical; confirm it with the full reply and actual logs.
Similar reply wording and observed status codes
mailbox is inactivemailbox is disabledrecipient disabledaccount closedaccount inactiveaccount disabledsuspended(inactive) user
Observed DSNs: 5.2.1, 5.5.4