SMTP Error 552

Description: Requested mail action aborted: exceeded storage allocation.

What does this mean?

The recipient’s email inbox is full. Uh oh! Looks like someone doesn’t check or clean their mailbox often enough.

How to fix SMTP Error 552?

The user you’ve tried to email has an inbox that is full. Unfortunately, the only way to resolve this would be to contact the recipient via another method letting them know their mailbox is full.