5.2.1 Mailbox disabled, not accepting messages

The mailbox exists but has been turned off, and will not take mail.

5.2.1 Mailbox disabled, not accepting messages

Permanent: retrying will not help

The mailbox exists but has been turned off, and will not take mail.

Usual causes

An account that was suspended or closed.
A mailbox that the owner set to refuse mail.

What to do

Treat it like an address that does not exist: stop sending to it.
Ask the person for another address if you need to reach them.

Usually the fault of: recipient.

Common questions.

What does 5.2.1 mean?

The mailbox exists but has been turned off, and will not take mail.

Will retrying fix 5.2.1?

No. It is a permanent failure, so retrying the same message will not help, and repeated attempts can hurt your sending reputation. Fix the cause first.

How do I fix 5.2.1?

Treat it like an address that does not exist: stop sending to it. Ask the person for another address if you need to reach them.

Other codes: 5.1.1 · 5.1.2 · 5.1.3 · 5.1.6 · 5.2.2 · 5.2.3 · 5.3.4 · 5.4.1 · Decode a whole bounce message

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