554 5.2.2 mailbox full

The classic "mailbox full" error!

The error message "554 5.2.2 Mailbox full" typically means that the recipient's email mailbox is full and cannot accept any new emails. This is usually a temporary issue, and the recipient will need to free up some space in their mailbox or upgrade their email plan to accommodate more storage.

Here are a few possible solutions:

1. Ask the recipient to delete some emails: The recipient can log in to their email account and delete some emails to free up space in their mailbox.
2. Upgrade their email plan: If the recipient has a limited email plan, they may need to upgrade to a plan with more storage space.
3. Use a different email address: If the recipient's mailbox is consistently full, they may want to consider setting up a new email address with more storage space.
4. Check for large attachments: If the email you're trying to send has a large attachment, it may be causing the issue. Try sending the email without the attachment or reducing the size of the attachment.

If you're the sender, you can try resending the email later or using a different email address. If you're the recipient, you can try deleting some emails or upgrading your email plan to resolve the issue.