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”

Related posts:

1. 451 – Requested action aborted – Local error in processing. (also called SMTP Error 4.5.1) SMTP Error 451 : The action has been aborted by...
2. 450 – Requested action not taken – The mailbox was unavailable at the remote end. A secondary SMTP error code may follow “450” to refine the reason for the failure to transmit the message, e.g. “SMTP Error 450 (also called SMTP Error 4.5.0) SMTP Error 450 : The server could not access the...
3. 250 – Requested mail action OK completed (also called SMTP Error 2.5.0) SMTP Status 250 : The mail server has successfully delivered...
4. 221 – The domain service is closing the transmission channel (also called SMTP Error 2.2.1) SMTP Error 221 : The server is ending the mail...
5. 422 – The recipient’s mailbox is over its storage limit (also called SMTP Error 4.2.2) SMTP Error 422 : Either the recipient’s mailbox is over...

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