SMTP Status Codes and Error Messages from Error 571


SMTP status code – 571 – I have been told not
to work with you !!!
(Also called SMTP Error 5.7.1)
SMTP Error 571 is usually a subset of SMTP Error 550.
So typically you will get an “SMTP Error 550 571” or an
“SMTP Error 550 5.7.1”. SMTP Error 571 is almost
always the recipient’s server telling your sending
server that “it has been told not to work with you !”.
The explanation text which follows the error response
usually does a good job of telling you why the remote
server does not want to work with your server (typically it
will be because your server/email-address is not
whitelisted, or you are not allowed to send messages
through this ISP’s SMTP server without providing
authentication, relaying not permitted, or your server is on
an RBL blacklist).
Typical SMTP 571 responses are : “5.5.0 SMTP; 571
Delivery not authorized, message refused” or “550 5.7.1
Mail from Ip_Address refused by blackhole site” or “571 email address we do
not relay” or “550 5.7.1 Relaying prohibited”

SMTP Error The following addresses had
permanent delivery errors
“The following addresses had permanent delivery
errors” / “The following address had permanent
delivery errors” : Either of these sentences are usually
followed by one or more email address(es).
The error message is effectively saying that the email
addresses listed do not exist, or no longer exist (if you
used to be able to email to them successfully). You need
to get the sender to verbally verify with the recipient what
his/her new email address is.

SMTP Error Mailbox is inactive
(The hosting ISP is having problems)
A typical error message might go like this : “A message
that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following
address(es) failed : XXXXXX Mailbox is inactive”.
This error is almost always a problem at the hosting
ISP which hosts the POP box(es) of the recipient’s
email address or domain. You need to inform the
recipient that there is a problem with their hosting
company. So, for example, if you are sending an email to and you get the “Mailbox is inactive”
error, then you need to tell John Doe that his hosting ISP,
ClaraNET, are having problems with incoming emails and
that he should talk to them.

Above are list of SMTP Errors Codes and Status Codes along with Error and Warning messages from Error 571 received while performing certain operation against mail server applications or related products.

What are SMTP Error Messages?
Simple Mail Transfer Protocol (SMTP) is an Internet standard for electronic mail (e-mail) transmission. SMTP protocol is used for sending e-mail messages between servers. Most e-mail systems that send mail over the Internet use SMTP to send messages from one server to another; the messages can then be retrieved with an e-mail client using either POP or IMAP.

In general, each SMTP error contains the following information:
• The SMTP Status Code or SMTP Error Codes or SMTP Reply Codes
• The message text. This text is usually returned with the Error code. Some messages employ word substitution, where the word substituted represents the system-replacement of a term more specific to the occurrence.
• An explanation of how the error may have occurred.

Hope this was helpful.

SQLServerF1 Team
Information about SMTP Error Codes or Status Codes and Error Messages on Windows, Linux Operating Systems.


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