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When someone is sending me an email they get the following error: "The following address(es) failed:firstname.lastname@example.org SMTP error
This message is generally returned by mail server when the recipient mailbox is not having any space for incoming mails.
Based on what the error is showing, you need to erase the unwanted emails in all of the folders, such as the "Sent" or "Trash" folders, in your Mailbox as its quota is full.
Alternatively, you can Add more to your Mailbox quota.