Forum: Ruby on Rails Undeliverable mail: Mail System Error - Returned Mail

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A7b48716ffda7d0b30acfe0a8a566221?d=identicon&s=25 unknown (Guest)
on 2006-06-08 01:25
(Received via mailing list)
Failed to deliver to ''
SMTP module(domain reports:
 host says:
 550 Requested action not taken: mailbox unavailable
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