What is a 550 email error?
A “550 Authentication is required for relay” error indicates that your email server requires SMTP authentication in order to send outgoing mail, but the email client used to send email has not been authenticated with your username and password.
What does 550 requested action not taken mailbox unavailable mean?
550 Blocked error or 550 Requested action not taken: mailbox unavailable is an SMTP (Simple Mail Transfer Protocol) error code. Put simply, this message means that the email you sent was blocked by the recipient’s email hosting server, and returned to you.
What does 550 rejected by header based manually blocked senders mean?
550. Rejected by header based Blocked Senders – Block policy for Header From. A Block Sender Policy has been applied to reject emails based on the Header From or Envelope From address. Delete or change the Blocked Senders policy.
What is the 550 no such user here error in email?
One common error you can get when sending email is the “ 550 No Such User here ” error. This error occurs when the sending email is rejected because the username cannot be found or is not accessible by the server.
What is error 550 51 user unknown?
‘550 5.1.1 User unknown’ is one of the common issues reported by users sending mails to Exchange servers. 550 error means there is some problem with the recipient server which makes it unable to deliver the mail.
Why am I getting “550 email blocked” error?
Almost all mail servers refuse to admit mails marked as spam, and it shows the error “ 550 Email blocked “. The most common reason for this error is IP blacklisting, where the sender’s server IP is listed as a spam source in SpamHaus, Senderbase, or other such email reputation tracking services.
What if the recipient doesn’t have the email address?
If the recipient doesn’t have the email address that you’re sending to, it will bounce the mail with the error message ‘ 550 5.1.1 User unknown ‘. Always validate the recipient email address you’ve given in the email for any spelling mistakes or errors. If everything is fine at your end, confirm whether the email account actually exists.