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Resolving 552 5.2.2 Mailbox Full Errors in cPanel

Last updated on Jun 2,2025 |

by leon.lee

Introduction

When sending outbound emails, you may encounter an error indicating that the message size exceeds allowed limits. A common example of this error is:

Error:

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

LMTP error after end of data: 552 5.2.2 <user@ipserverone.com>
Mailbox is full / Blocks limit exceeded / Inode limit exceeded

Prerequisites

Basic Email Knowledge: Understanding of sending emails and managing attachments.
Access to WHM (Web Host Manager): As a root user or a reseller with the necessary privileges.

Step-by-Step Guide

Step 1: Identify the Error

Review the bounce-back email. If it contains a message like “552 5.2.2 Mailbox is full / Blocks limit exceeded / Inode limit exceeded,” the recipient’s server rejected the message due to storage limits.

Step 2: Understand the Cause

The “552 5.2.2” error is usually caused by resource limitations on the recipient’s mail server. Common causes include:

Mailbox is Full: The recipient’s mailbox has reached its storage quota.
Server Disk Usage is Full: The entire server may be low on disk space, affecting all hosted accounts.
cPanel User Quota is Full: The user’s cPanel account has consumed its disk space quota.

Step 3: Suggested Solutions

Depending on the identified cause, apply one or more of the following resolutions:

Check Email Disk Usage: Use cPanel to verify the storage used by the email account.
➤ How to Check Email Disk Usage via cPanel
Increase Email Quota: Raise the storage limit for the affected email account if it has reached its quota.
➤ How to Change Email Quota in cPanel
Increase Disk Quota in WHM: If the entire cPanel account is full, update the disk space allocation via WHM.
➤ How to Increase Disk Quota in WHM/cPanel
Check Server Disk Usage: Ensure the server itself is not out of space.
➤ How to Check Server Disk and RAM Usage

Conclusion

Email rejections with error code 552 5.2.2 are typically due to disk space, block, or inode limitations. You can resolve the issue by increasing quotas, cleaning up mailboxes, or confirming with the recipient if their hosting environment is the source of the problem.

If you continue to experience this issue, feel free to contact our support team at support@ipserverone.com.

Article posted on 29 May 2025