Error message: 550 5.5.0 Requested action not taken: mailbox unavailable
Description: This error message occurs when an email cannot be delivered because the recipient's mailbox is unavailable. This can have various causes, such as an invalid email address, a full mailbox or technical problems on the recipient's side.
Possible causes:
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Invalid email address:
- The email address entered does not exist or contains a typo.
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Full mailbox:
- The recipient's mailbox has reached its maximum storage capacity.
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Technical problems:
- The recipient's mail server is experiencing temporary problems.
Solutions:
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Check the email address:
- Make sure the email address is spelled correctly and exists.
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Contact the recipient:
- Use another means of communication to check whether the recipient can solve the problem, for example by freeing up space in the mailbox.
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Wait and try again later:
- If the problem is due to temporary server problems, sending the email again later may succeed.
Additional information: This error message is a standard SMTP status code indicating that the email could not be delivered because of a problem with the recipient's mailbox. For more details about SMTP status codes, see the list of SMTP server return codes.
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