4.x.x transient failure
SMTP Error Code 452: Meaning, Causes and How to Fix It
SMTP 452 is a temporary (transient) failure.
The action failed because the server is short on a resource, typically storage or the number of recipients it will take in one session. Sending fewer recipients per message, or simply retrying later, usually works.
- Class
- 4xx transient
- Bounce type
- Soft bounce
- Highest severity
- Medium
- Responses on record
- 8
Google
Outlook
Rambler
Yahoo Inc
ZohoSMTP 452 responses from email providers
How mailbox providers phrase a 452. Open a provider for the full text, severity and fix for every variation.
Comcast2 responses
Google1 response
Outlook1 response
Rambler1 response
Yahoo Inc1 response
SMTP 452 questions
›Is SMTP 452 a hard bounce or a soft bounce?
It is a transient failure, so a soft bounce. The sending server queues the message and retries it automatically for a while (often 24 to 72 hours) before it gives up.
›What causes an SMTP 452 error?
The action failed because the server is short on a resource, typically storage or the number of recipients it will take in one session. Sending fewer recipients per message, or simply retrying later, usually works. The exact reason varies by receiver, which is why this page lists the specific 452 responses recorded for Comcast, Google, Outlook, Rambler, Yahoo Inc, Zoho.
›How do I fix an SMTP 452 bounce?
Read the enhanced status code and the message text, not just the number. Wording that names the recipient (user unknown, mailbox unavailable) means correct or remove the address. Wording that names authentication or reputation (SPF, DKIM, DMARC, blocklist) means fix that on the sending side, or clear the listing. Every response on this page has its own guidance.