What filtering provider uses the bounce message '452 Too many recipients received this hour' and how to resolve it?

Email marketer from Email Geeks responds that the bounce message indicates throttling, suggesting slowing down or spreading out the sending volume.

Email marketer from Digital Ocean Community shares that the error message "452 Too many recipients received this hour" typically indicates that you have exceeded the hourly sending limits imposed by your email service provider. The solution is to reduce your sending rate or upgrade your plan to allow for higher limits.

Email marketer from SuperUser suggests that '452' often arises from resource constraints on the server side. They suggest retrying after some time and examining server logs for insights into the root cause.

Email marketer from Reddit explains that the bounce message often means you're hitting rate limits imposed by the recipient's email server. To resolve this, they suggest implementing a queuing system and sending emails over a longer period with delays between each email.

Email marketer from Stack Overflow responds that the error "452 Too many recipients received this hour" in Postfix usually indicates a configuration issue with the `smtpd_recipient_limit`. Increasing this limit in the `main.cf` file may resolve the problem, but it should be done cautiously to avoid overloading the server.

Email marketer from Mailjet shares that bounce messages such as '452 Too many recipients received this hour' are soft bounces. They can resolve themselves or can indicate a need to reduce sending rates or segment lists.

Expert from Email Geeks, after investigation, identifies Proofpoint as the filtering provider associated with the bounce message "452 Too many recipients this hour", noting that the domains, including .edu domains, point to Proofpoint.

Expert from Email Geeks shares that doing MX lookups on the domains to see if anything jumps out can help identify the filtering provider (e.g., pphosted.com is Proofpoint).

Expert from Word to the Wise discusses how the error code signifies a temporary block due to reputation or infrastructure issues and suggests warming the IP address and fixing list management issues.

Expert from Spam Resource explains that a 452 error often means the sender has tripped a throttling mechanism on the receiving server. They advise reducing sending volume and ensuring proper list hygiene to avoid triggering the limit.

Documentation from RFC outlines the meaning of SMTP reply codes. It does not specifically reference '452 Too many recipients received this hour', but explains that 4xx codes indicate temporary failures where the request might be successful later.

Documentation from cPanel explains that a 452 error can be a temporary server issue or a limit on the number of recipients. They advise checking server logs for specifics and contacting your hosting provider if the problem persists.

Documentation from Microsoft Learn explains that the SMTP error code 452 indicates that the server failed to complete the request because it lacks sufficient system storage. This can be caused by server issues unrelated to filtering but related to server overload.