SMTP Status Codes and Error Messages from Error 452 to 465


SMTP status code – 452 – Requested action not taken – Insufficient storage.
(also called SMTP Error 4.5.2)
SMTP Error 452 : The ISP server’s disk system has run
out of storage space, so the action had to be cancelled.
Unless you are with an ISP which is so slack that they
have not implemented Disk Full Alerts, this error usually
indicates that your ISP’s mail server is overloaded from too
many messages. This can happen even to the best ISPs
when, for example, there have been problems and none of
the ISP’s customers could send mail; as soon as the
problems are fixed there is almost always a situation where
thousands of users and organizations are trying to send
mail all at the same time, and those numbers can
occasionally result in the ISP’s mail servers’ hard disks
temporarily filling up, with SMTP Error 452 being the result.
The next attempt to send by your server may prove

SMTP Error 452 : Most ISPs mail servers impose a
maximum number of concurrent connections that client’s
mail servers can attempt to make, and they usually also
have a limit on the number of messages that are sent per
connection. With business customers these maximums
are rarely reached, if ever. Nevertheless, If you have a lot
of messages queued up, for example as a result of the
connection to your ISP going down for a significant amount
of time (and you have hundreds of users in your
organization, or it happened just as you were about to
send that large mailshot!), there could be a situation where
the output of messages from your server goes over the
maximum number of messages per connection allowed by
your ISP. This is another case where the ISP’s server may
issue a 452 SMTP error. As above, the next attempt to
send by your server may prove successful.
SMTP Error 452 : This error can also be indicative of a
problem on your own mail server. Here is an example of
an SMTP 452 error : “”452 Out of memory”

SMTP status code – 465 – Code Page unavailable on the recipient server
(also called SMTP Error 4.6.5)
SMTP Error 465 : This is an Exchange Server-specific
error code. This error is returned by the recipient’s server
if the incoming email specifies a Code Page that is not
installed on the recipient’s server, normally because not all
language files were installed on the server during either the
installation of Windows or of Exchange Server.
Update : in 2012 we are seeing other mail server
programs and web applications now using SMTP Error
465. For example the osTicket product will return
“465 SMTP: Invalid response code received from server” if
the SMTP server you are using in your configuration of
osTicket, requires authentication and you have set up the
authentication incorrectly

Above are list of SMTP Errors Codes and Status Codes along with Error and Warning messages from Error 452 to 465 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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