SMTP Error Codes & SMTP Status Codes & SMTP Reply Codes R eference 2010

What is “SMTP Error” ? What does it mean ? There comes a time in the life of a
Computer Consultant where, one day, he/she will have to deal with email server problems. It
is inevitable. Sometimes these problems will be with the interfacing of the mail server with the
ISP, in particular an inability to send mail. After checking the usual suspects such as lack of
connection (your broadband line is dead), faulty router, firewall problems, DNS problems, or
an incorrect SMTP server name (thanks to some clever ISP changing its SMTP server name
without informing anyone – it happens!!), you will likely start delving a little deeper by checking
if your email server reports any errors.
Depending on the actual problem it is encountering, your mail server may not be able to
provide detailed help on how to resolve the problem, and may instead only be able to provide
you with an SMTP Status Code in your server’s log (these codes are also known as SMTP
Error Codes or SMTP Reply Codes), or emails will be returned to the sender with error text.
A classic reply might be, for example, “SMTP error from remote mail server after end of data -
<host ip-address> : 550 Error: Message content rejected”, or “SMTP error from remote mail
server after RCPT TO <email-address>, 550 5.1.1 User unknown” or “SMTP Error: Data not
accepted” or “SMTP Error: The following recipients failed”. It is just for such cases that we
have produced this document (we use it too !! J ). What does 550 mean ? What does 550
5.1.1 mean (or, shortened, what does 511 mean ?) ? What does “Data not accepted” mean ?
What is SMTP error 553, what does it mean ?
So, use this document as a quick reference to common Mail Delivery Errors, SMTP status
codes or SMTP error codes for SMTP mail servers such as AA Mail Server, Alt-N MDaemon,
ArGoSoft Mail Server, Axigen Mail Server, Barracuda Spam Firewall, Chilkat SMTPQ, CMail,
CMailServer, E-Mail Anywhere, FTGate, GMS Mail, Internet Anywhere, Kerio MailServer
(KMS), Lotus Notes, MailEnable, Mailman, MailMax, Mailtraq, Merak Mail Server, Microsoft
Exchange (Exchange Server 2003 NDR, Non-Delivery Report, error codes), Novell
GroupWise, Qmail, PostCast Server, PostConf, PostFix, PowerMTA, QK (QKSoft) SMTP
Server, Rockliffe MailSite, SendMail, SquirrelMail, SurgeMail, TFS Secure Message Server,
VisNetic Mail Server, WinMail, Zimbra, or any other SMTP / ESMTP standards compliant
e-mail MTA.
Note : the following list of SMTP reply codes can also be used to troubleshoot Eudora
or FoxMail email problems, Outlook error codes, Outlook Express error codes
(Windows 2000/XP), Windows Mail Error Codes (Vista), Thunderbird problems, or other
email program problems when those programs send and collect emails directly to and
from the Internet as opposed to through a corporate email system. The error codes
returned are the same.
Finally, there are no better tools for resolving complex SMTP error situations than the
WHOIS, Name Server Lookup, Trace Route, and PING tools of our own
The Ultimate Troubleshooter available on our AnswersThatWork.com website – that is
how we ourselves quickly solve complex SMTP error situations.

AnswersThatWorkTM SMTP Status codes – SMTP Error Codes – SMTP Reply Codes – 2010

See detail below

http://www.answersthatwork.com/Download_Area/ATW_Library/Networking/Network__3-SMTP_Server_Status_Codes_and_SMTP_Error_Codes.pdf