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IT Toolbox

Understand, diagnose and solve IT problems

SMTP 450 4.2.0 — MailboxOceania

The recipient is temporarily unavailable.

The server cannot accept the message due to lack of resources or quota.

The recipient address does not exist or is not recognized by the remote mail domain.

The server refuses routing or access to the recipient.

The message is rejected because the authentication of the sender domain is insufficient according to the policy of the recipient.

PHP reached its memory limit during execution.

Windows Update is not able to properly resolve or join its update service.

Windows Update client exceeds a delay when communicating with the service.

Downloading a Windows update is not ending correctly.

Windows update or functionality cannot be installed.