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 successful.

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”

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SMTP Error 451 : The action has been aborted by the ISP’s server. “Local” refers to the ISP’s server. This error is usually due to overloading at the ISP from too many messages or transient failures. Typically some [hopefully] temporary event prevents the successful sending of the message. The next attempt to send by your server may prove successful.
If this error keeps occurring to the point that it has effectively lost its transient nature and has become ….. frequent (!!), then the problem is at your end and you should check your own mail server (if you email out of a corporate network), communications on your side (router, server network card), or inform your ISP if your mail server relays through your ISP or if you are a home user emailing out through Outlook, Outlook Express, Windows Mail, or similar email program.

Example of typical SMTP Error 451 return messages :
“SMTP error 451 Unable to complete command, DNS not available or timed out” or “451 Domain of sender address does not resolve” or “451 Error getting LDAP results in map”.

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please try later,Server error: 451 Unable to contact remote system,server error: proxy_error zimbra,symantec brightmail message aborted by the sender,server error: \451 resources temporarily unavailable,server error: \451 too many messages \,server error: \451 unable to contact ldap,server is giving a “deferred 451” error,server replied:451 error:temporary lookup failure,server request action aborted on mfe proxy htc,server returned status code 451 - error in processing,server returns 451 requested action aborted: error in processing,server said: requested action aborted: local error in processing,sunucu yanıtı: 451 requested action aborted: error in processing,serverfehler 451,sunucu yanıtı: 451 requested action aborted,Server error: 451 Requested action aborted: error in processing,symantec error 451 temporary email-query failed,server error451 too many messages,sbs 451 Requested action aborted: local error in processing,send 451 request action aborted,temporary local error 451 in microsoft outlook,temporärer serverfehler [451 requested action aborted: local error in processing],send error 451 smtp,send failed for message 451 requested action aborted,system locale error 451,symantec ldap abort messages,sendmail 451 unable to contact dnc,sendmail deferred 451 requested action aborted,sendmail deferred: 451 requested action aborted: local error in processing,sendmail error 451 name server timed out,sendmail stat deferred connection timed out xmail,server 451 outlook,symantec error 451 unexpected error james,server 451 speed limit,server error 451 local problem,serverfehler: 451 requested action aborted: local error in processing\ web de,brightmail abort message,800ccc6a smtp_451_error_processing error processing request,800ccc6a assp,800ccc6a,453 requested action aborted,452 request aborted,451smtp,451-\requested action aborted: local error in processing (code: 11)\,451-the server has reached its limit for processing requests from your host status 4 0 0 transient failure,451-problem beim imail,451) local error in processing,: 451 internal resource temporarily unavailable (in reply to rcpt to command),abort message status in symantec messaging gatewy,brightmail 451 requested action aborted: local error in processing,brightmail (268439555) local error in processing -,brightmail & 451 Timed out,bluehost error 451,bluehost com smtp 451 temporary local problem,aid: 451 Requested action aborted: local error in processing (in reply to RCPT TO command)) postfix,activegate 451 Local error,aborting: action [setsourcedirectory] requested abort datacap,aborting an outlook express process,aborted e-mail,451 ошибка outlook,451 validating sender: unable to complete command dns not available or timed out,451 unable to contact ldap email,451 speed limit email,451 smtp server,451 smtp host lookup,451 smtp errors,451 sending rate limit has been exceeded try again later,451 requested action aborted:local error in processing (code: 11): retry timeout exceeded,451 requested action aborted:local error in processing,451 requested action aborted:(-21) local error in processing,451 requested action aborted: session in inconsistent state 250,451 requested action aborted: retry timeout exceeded,451 speed limit error hostmonster,451 speed limit outlook error,451 unable to contact dns \,451 unable to contact dns (in reply to mail from command,451 unable to complete command dns not available or timed out (in reply to mail from command),451 temporary recipient validation error,451 temporary local problem please try later exchange 2007,451 temporary local problem pakai cpanel,451 temporary local problem outlook 2010,451 temporary local problem mediatemple,451 temporarily unable to process your email please try again later : retry timeout exceeded,451 stmp,451 requested action aborted: local error in processing status,brightmail smtpsendfailedexception,email 451 error,diagnostic-code: smtp; 451 cannot process grd failure,diagnostic-code: smtp; 451 4 0 0 Temporary message delivery failure try again,deferred: 451 mail lookup failed,deferred mail protocol violation (451 internal error ),deferred email 450 4-3-2,deferred 451 the server has,deferred 451 requested action aborted local error in processing,data state transient error - 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please try later,cpanel smtp erro 451 temporary local p,cpanel error smtp 451,cpanel 451 try again later,cpanel 451 451 temporary local problem - please try later (state 14),com sun mail smtp smtpsendfailedexception: 451 user is over quota,com sun mail smtp smtpsendfailedexception: 451 unexpected error,com sun mail smtp smtpsendfailedexception: 451 temporary failure please try again later,com sun mail smtp smtpsendfailedexception: 451 4 3 2 please try again later,com sun mail smtp SMTPSendFailedException: 450 Requested action,com sun mail smtp smtpaddressfailedexception:451,c# 451 action aborted local processing error,451 error processing message,451 451 user is over quota (state 14),451 451 unable to verify user (state 14),451 451 try again later (state 14),451 451 requested action aborted: local error in processing (code: 11) (state 14),451 451 requested action aborted (state 14),451 4 5 1 requested action aborted: local error in processing fope,451 4 5 0 error processing,451 - requested action aborted: local error in processing,450 requested action aborted [7 2] 17004,450 requested action aborted [7 1] 12315,451 5 3 4 requested action aborted; local processing error,451 aborted disallow sender !,451 error in smtp,451 error in processing,451 dns temporary failure error on cpanel server,451 dns temporary failure and outlook 2007,451 disallow sender,451 Connection timeout try later (in reply to end of DATA command),451 cannot prossess grd failure,451 cannot process test@example com grd failure [31 ms],451 cannot process test@example com grd failure,451 cannot process grd failure (in reply to rcpt to command),450 requested action aborted error in processing,450 requested action aborted 7 1 12316,450 local error in processing,1and1 ftp erreur 451,1and1 error 451,1and1 email 451,1ana1 error message 451,1&1 smtp 451 code 11,0x800ccc6a smtp 451 ldap,0x800ccc6a smtp 451 error processing - 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SMTP Error 450 : The server could not access the mailbox to deliver the message. This could be caused by a process on the remote server tidying up the mailbox, or the remote mailbox could be corrupt, or the remote mailbox may be stored on another server which is currently offline, or the network connection went down while sending, or the remote mail server does not want to accept mail from your server for some reason (IP address, blacklisting, etc..). In general SMTP Error 450 is a transient error at the remote end (the destination), or at one of the servers en route to the remote end, and should induce your mail server to retry after it’s preset retry interval.

Example of an SMTP Error 450 reply message : “450 Please try again later”.

SMTP Error 450 is often followed by a second SMTP error code to refine the reason for the email not reaching its destination. For example : “SMTP Error 450 5.2.3 Msg Size greater than allowed by Remote Host”. When that is the case and If the error message is not as clearly worded as in this example, then simply search this document for the secondary error code. In this case searching this document for SMTP Error 523 or SMTP Error 5.2.3 would yield an explanation identical to the wording above.

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SMTP Error 449 : This is a Microsoft Exchange Server specific error code. As per Microsoft’s documentation this error code is returned when either of the following conditions occurs : an SMTP connector is configured to use DNS without a smart host and also uses a non-SMTP address space (e.g. X.400), or A message was sent to a recipient who was identified as a member of a routing group that was deleted.
Microsoft recommends using the WinRoute tool to troubleshoot this error (Microsoft Knowledgebase article 281382)

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SMTP Error 447 : Your outgoing message timed out because of problems with the receiving server who objected to your message. Typically there is a problem with the message header (such as too many recipients, in most cases, or a protocol timeout between the two servers).

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