IIS 6 - Mail server issues

I have 3 mailboxes in IIS 6 on my server 2003 machine, and I'm having issues with 1 of the accounts. When I try to send an e-mail to this account i get an error message:

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 Unknown user - DYN001 (state 14).

I have tried deleting the mailbox/user account on Server 2003 and recreating it, but I'm still getting this problem. The other two mailbox accounts work just fine, and I was using the same incoming/outgoing POP3 settings on all 3 accounts.
Stangman66Asked:
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meverestCommented:
perhaps,

I am suggesting that you need to:

a) confirm that it is dyndsn servers that are rejecting the email (look at the NDR mail to check this) and
b) ask DYNDNS to check it out for you.

I think that it is likley that this is the problem.  If they can't/won't fix it then they will at least give you some indication on what you need to do to resolve it.

Cheers.
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meverestCommented:
Hi,

are all 3 email addresses have the same domain?

cheers.
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Stangman66Author Commented:
Yeah, all three have the same domain.
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Stangman66Author Commented:
Also, I can send mail with this account (mailbox 3) to my gmail account, but when I send mail from the gmail account to mailbox3 I get a "Mail Delivery Subsystem" notification failure reply. If i send an e-mail from mailbox3 to mailbox3 I get no messages and no "Mail Delivery Subsystem" notification replies.

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meverestCommented:
take a look at the smtp server logging.  Make sure that logging is enabled first, and use the 'ncsa common' log format.

Cheers.
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Stangman66Author Commented:
Where do I find that at? I'm using DYN DNS as my mailhop provider.
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meverestCommented:
"mailhop provider"? - do you need to add the email address there too?

Cheers.
 
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Stangman66Author Commented:
Guess I could be explaining it wrong.

I have registered my domain name with DYNDNS. I then setup what they call "Mailhop relay" to (MYDOMAIN.com on port 25)

Well, 2 of 3 e-mail accounts work fine  //these are setup on server 2003 with the associated "user account created" with the mailbox.

1 of these accounts I cannot RECEIVE mail, but I can send it out. (if mail is sent to this account I get that mailer return error)

I've tried deleting the account and recreating it in server 2003. Any suggestions on how to fix this?
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meverestCommented:
Hi,

yeah, OK, so the primary MX records point to the dyndns servers, yes?  In that case, you probably need to ask them why your mail is bouncing.

according to the bounce message, it says "google tried to send your message but the remote server refused to accept it because...."  assuming that you used gmail to send the email, then it will actually be the dyndns mail server that google is trying to send it to.

you can usually confirm that by looking carefully at the bounce message - usually it will tell you the address or hostname of the remote server.  The mail is probably never even arriving at your own mail server.

Cheers.
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Stangman66Author Commented:
OK, so that means I need to contact DYDNS for resolution - correct?
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Stangman66Author Commented:
Thank you for your time!! :)  You got it dead on, it needed to be added to their "user list"
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