Error 550 is another Outlook bug faced by users while sending and receiving emails through MS Outlook. This error is common and occurs when authentication for outgoing mail server is not set. Or you can say, error 550 is a SMTP (simple mail transfer protocol) outgoing server error code. This email message encounters a relay error. Being a generic error message, it is often used to indicate a spam that has blocked the email message from reaching the recipient.
The email returns back without getting delivered with an error message prompted as either of the following :
“550 Requested action not taken: mailbox unavailable”
“550 5 2 1 mail from refused spam site”
"The message could not be sent because one of the recipients was rejected by the server. Server Response: '550 not local host, not a gateway', Port: 25, Secure (SSL): No, Server Error: 550, Error Number: 0x800CCC79
All these error messages together states that SMTP server ia unable to deliver the mail to user.
Main causes of the Error 550
- Authentication is denied while sending email
- Email address may be incorrectly typed
- ISP imposing restrictions for outgoing mails on server
- Virus infection
Get Rid of Error 550
When you are unable to send emails to the recipient and receiving error 550 regularly then you are required to solve this issue with the help of PST Repair software. This is a professional and totally automatic tool designed to solve Outlook's errors.
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