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aimgreenviper@riseup.net: host mx1.riseup.net[198.252.153.129] said: 450 4.7.1 aimgreenviper@riseup.net: Recipient address rejected: Sorry, your message cannot be delivered to that person because their mailbox is full. If you can contact them another way, you may wish to tell them of this problem (in reply to RCPT TO command)