451 Requested action aborted: local error in processing

The receiving server hit a problem handling your message and gave up for now. It is a temporary failure.

451 Requested action aborted: local error in processing

Temporary: it may work if you retry

The receiving server hit a problem handling your message and gave up for now. It is a temporary failure.

Usual causes

A fault or overload on the receiving side.
A temporary failure when the server looked up your domain in DNS.
Greylisting or rate limiting, worded as a local error.

What to do

Retry later. Most mail systems do this on their own.
Check that your domain’s DNS answers quickly and correctly, since some servers check it while accepting the message.

Usually the fault of: receiving server.

Common questions.

What does 451 mean?

The receiving server hit a problem handling your message and gave up for now. It is a temporary failure.

Will retrying fix 451?

Often yes. It is a temporary failure, and mail systems retry for you. If it keeps failing for days, look at the causes listed above.

How do I fix 451?

Retry later. Most mail systems do this on their own. Check that your domain’s DNS answers quickly and correctly, since some servers check it while accepting the message.

Other codes: 250 · 421 · 450 · 452 · 500 · 501 · 503 · 530 · Decode a whole bounce message

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