Recipient Address Rejected: Recipient Mailbox is Full: The Cox email address in question is over its storage limit. Cox email accounts are currently set up with a 30 MB storage limit. If a user of Cox goes over the 30 MB storage limit, emails sent to that account will be returned to the sender until the space has been cleared.
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Dec 22, 2020 · Instead, a mailer-daemon uses the email header, which includes a return path containing the sender's address. By forging your address in the email header, spammers can send messages that appear to be from you without having access to your account. If they send an email to an address that no longer exists, then you receive mailer-daemon spam.