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The mail system
<email@example.com>: Protocol error: host
mx.plala.or.jp[**.**.**.**] said: 354 Enter mail, end with "." on a line
by itself (in reply to MAIL FROM command)
Failed delivery status
Final recipient firstname.lastname@example.org
Reason for failure 354 Enter mail, end with "." on a line by itself
Remote mail server mx.plala.or.jp
Reporting mail server buzz.info