SMTP Status Codes and Error Messages from Error 553
SMTP status code – 553 – Requested action not taken – Mailbox name invalid. or You are attempting to send emails through a specific ISP’s SMTP server without authentication and without being connected to the Internet through that ISP’s service or You are sending from an Exchange server configured to send via DNS and you do not have a public reverse DNS record pointing back to your Exchange server
(also called SMTP Error 5.5.3)
SMTP Error 553 : There is an invalid email address in
the “To“, “CC”, or “BCC” field of the email message.
Here is a typical SMTP Error 553 response :
”Hi. This is the QMAIL-send program at <ip-address>. I’m
afraid I wasn’t able to deliver your message to the following
addresses. This is a permanent error; I’ve given up. Sorry
it didn’t work out. <Email-address-you’re-sending-to> :
<remote-mail-server-ip> does not like recipient. Remote
host said: 553 5.3.0 <Email-address-you’re-sending-to>.
Addressee unknown. Giving up.”.
SMTP Status 553 is also sometimes returned by an ISP
mail server. When this happens this is almost always
because you are trying to send through a specific
ISP’s SMTP server and yet you are not connected to
the Internet through that ISP; for example : you have
connected to the Internet through a Comcast broadband
connection but your email program (Outlook Express,
Windows Mail, …) is configured to send emails through the
SMTP server of Tiscali. A typical such error message
might be : “553 sorry, relaying denied from your location”.
SMTP Error 553 can also be received if you are sending
from a Microsoft Exchange server configured to send
directly via DNS (rather than by relaying to an ISP’s
SMTP server) and there is no public reverse DNS
record pointing back to the public IP of your Exchange
Server, in which case some receiving mail servers return
a 553 error because they weren’t able to verify that your
server’s HELO name matched its public outgoing IP
address. A typical error message for this 553 response
might be : “5.5.0 smtp;553 sorry, that domain isn’t allowed
to be relayed thru this MTA (#5.7.1)” or “5.5.0 smtp;553
sorry, that domain isn’t in my list of allowed rcpthosts
Above are list of SMTP Errors Codes and Status Codes along with Error and Warning messages from Error 553 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.