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This is an informative message sent by Kerio MailServer 6.0.3 at
The server was not able to deliver your mail message to the following addresses:

<angie<_at_>> ( 421 4.0.0 Server error)

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From RFC2821:

421 <domain> Service not available, closing transmission channel
(This may be a reply to any command if the service knows it
must shut down)

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