SMTP Status Codes and Error Messages from Error 471 to 500
SMTP status code – 471 – This is a local error with the sending server and is often followed with “Please try again later”
(also called SMTP Error 4.7.1)
SMTP Error 471 : This is always a local error with your
own mail server. SMTP Error 471 (or 4.7.1) is usually
tagged onto a primary SMTP error code, for example
“SMTP Error 450 4.7.1”, or “SMTP Error 451 4.7.1”, or
“SMTP Error 550 4.7.1”; example : “451 4.7.1 Greylisting
in action, please come back in 00:02:00 [minutes]”. In all
the cases that we have seen SMTP Error 471 is usually
caused by anti-spam or virus scanning software on your
server (the sending server) getting into problems through a
bug in the software, or because of a bad automatic update
from the antivirus/anti-spam manufacturer, because of lack
of memory on your server, or because of hard disk
SMTP status code – 500 – Syntax error command not recognized.
(also called SMTP Error 5.0.0)
SMTP Error 500 : The last command sent by your server
was not recognized as a valid SMTP or ESMTP command,
or is not formatted in the way the server expected. This
includes situations where the command is too long.
Note that commands that are recognized, but not
implemented, are handled by different status messages
(see 502 and 504).
Note : A “500 unrecognized command” server response
is often a case of antivirus software and/or firewall
interfering with incoming and/or outgoing SMTP
communications. Read your antivirus / firewall software
documentation thoroughly to solve the problem.
Examples of SMTP Error 500 error messages : “SMTP
Permanent Error: 500 Access Denied By Port Access” or
“SMTP Error 500 Line too long”.
Above are list of SMTP Errors Codes and Status Codes along with Error and Warning messages from Error 471 to 500 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.
Information about SMTP Error Codes or Status Codes and Error Messages on Windows, Linux Operating Systems.