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How to fix “550 no mailbox by that name is currently available” email error

Email errors can be quite confusing.

550 no mailbox by that name is currently available” is such an error. It says that there’s no mailbox by that name, but you KNOW it exists. You can’t argue with a machine. It can be very frustrating.

At Bobcares, we often resolve such email errors as a part of our Technical Support Services for web hosting companies.

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How to fix  ‘553 sorry, unknown email address’ error in  Outlook, Thunderbird and Outlook Express

How to fix  ‘553 sorry, unknown email address’ error in Outlook, Thunderbird and Outlook Express

‘553 sorry, unknown email address’ is a common email error that happens because the recipient address is invalid. The senders would see this error in the bounce message they receive.

Error 553 is also called SMTP Error 5.5.3 and can happen irrespective of what mail server the sender is using – Exim, Qmail, Exchange, etc. (more…)