552 5.2.2 / 452 4.2.2: Mailbox full / over quota

AnySMTP

The error usually looks like this:

552 5.2.2 The email account that you tried to reach is over quota.

What it means

The recipient’s mailbox has run out of storage space.

Common causes

  • The recipient has reached their mailbox storage limit.

How to fix it

  1. Contact the recipient another way – they need to free up space before they can receive email.

A free tool provided by Auth-Email

Auth-Email makes your Gmail, Outlook, or other OAuth 2.0 email account available to any IMAP, POP3, or SMTP email client — no app passwords or special configuration needed.

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