No subject

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3rd and following lines has no plobrem.
Maybe, this first line is last line of previous mail.
But I don't know why it was leaved.
At such cases, when user tried to get his mail by pop3 client
on remote host, and close connection by server immidiate.

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-ERR Mailbox isn't a valid mbox file
Connection closed by foreign host.
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Every time I delete 2 lines from his mailbox to restore on server
console when it corrupt.
Has anyone such problem?

OS: RedHat Enterprise Linux 4
Dovecot version: 0.99.11-4.EL4 (RH official rpm)