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کد:
failure notice
From:
"MAILER-DAEMON@yahoo.com" <MAILER-DAEMON@yahoo.com>
Hi. This is the qmail-send program at yahoo.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.
<ex@yahoo.com>:
failed after I sent the message.
Remote host said: 554 delivery error: dd This user doesn't have a yahoo.com account (ex@yahoo.com) [-5] - mta1228.mail.mud.yahoo.com