Emails returned when sent initially - ok if resent

C

Connie

I have a problem sending emails that happens sporadically. When I
send an email initially, the mail is returned undelivered. The
message is included below. If I resend the message from my Sent
folder; the email is delivered with no problems. Any help would be
greatly appreciated!

Bounce back message:

This is the mail system at host leviathan.cnchost.com.

I'm sorry to have to inform you that your message could not be
delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your
own text from the attached returned message.

The mail system

<[email protected]>: host mx3.earthlink.net[209.86.93.228] said: 550
[email protected]...User unknown (in reply to RCPT TO command)

Details provided with bounce back message:

Reporting-MTA: dns; leviathan.cnchost.com
X-ConcentricHost-2-70--Relay-Queue-ID: 290952FF7
X-ConcentricHost-2-70--Relay-Sender: rfc822; [email protected]
Arrival-Date: Sat, 9 Oct 2010 15:03:07 -0400 (EDT)

Final-Recipient: rfc822; [email protected]
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx3.earthlink.net
Diagnostic-Code: smtp; 550 [email protected]...User unknown
 
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