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strange email bounce

N

nandar

Guest
CentOS 5 + Plesk 8.6.5

I sent one email to my friend. I got bounce email saying:

==============================
Hi. This is the qmail-send program at mymailserver.com.
I'm afraid I wasn't able to deliver your message to the following
addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

< here are tons of email addresses that I didn't send>

<here is the email header and contents that I sent to my friend>
===============================

My friend got the email that I sent.

How can it happen? Can anybody explain me? How can I protect that not to happen?
My Plesk server relay setting is "authentication required POP3 (lock time 20 minutes) + SMTP"

Please help me to solve this problem asap. Thanks.
 
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