Error Description
SMTP error 453 is a transient or "4xx" error code returned by a mail server to indicate that it has encountered a temporary issue while processing an email message. This error suggests that the server is unable to complete the requested action at that moment, but the issue may be resolved in the future.
What's Causing This Error?
SMTP error 453 can be caused by various reasons, including::
- Server overload: The mail server is currently processing a high volume of incoming email traffic, and it temporarily rejects new connections or delays email delivery to reduce its workload.
- Resource constraints: The server may have limited resources (such as CPU, memory, or disk space) available, and it temporarily restricts new email deliveries to manage these resources effectively.
- Temporary server issues: Server hardware or software issues, network problems, or other transient issues can also lead to SMTP error 453.
How to fix SMTP Error 453?
- Wait and retry: Since SMTP error 453 is a temporary issue, the best course of action is to wait and retry sending the email later. The receiving server may have been overloaded or temporarily unavailable, and the problem may resolve itself.
- Investigate resource constraints: If you have control over the receiving server, consider investigating and addressing any resource constraints that may be causing the error.
SMTP Error 453 Examples
Example 1: "453 4.3.2 Temporary failure, please try again later."
Example 2: "453 4.7.1 Server overloaded - Try again in 15 minutes."
Example 3: "453 4.4.3 Server resources exhausted, try again in a few minutes."
