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Error:Expected "250" Server rejected the recp address

Error:Expected "250" Server rejected the recp address

(OP)
I get this running smtpdiag, from what I see I don't think it's our server, but not sure.

Searching for Exchange external DNS settings.
Computer name is HEXCHANGE.
VSI 1 has the following external DNS servers:
There are no external DNS servers configured.

Checking SOA for hexion.com.
Checking external DNS servers.
Checking internal DNS servers.

Checking TCP/UDP SOA serial number using DNS server [192.168.1.5].
TCP test succeeded.
UDP test succeeded.
Serial number: 2006010115

Checking TCP/UDP SOA serial number using DNS server [192.168.1.3].
TCP test succeeded.
UDP test succeeded.
Serial number: 2006010115
SOA serial number match: Passed.

Checking local domain records.
Starting TCP and UDP DNS queries for the local domain. This test will try to
validate that DNS is set up correctly for inbound mail. This test can fail for
3 reasons.
    1) Local domain is not set up in DNS. Inbound mail cannot be routed to
local mailboxes.
    2) Firewall blocks TCP/UDP DNS queries. This will not affect inbound mail,
but will affect outbound mail.
    3) Internal DNS is unaware of external DNS settings. This is a valid
configuration for certain topologies.
Checking MX records using TCP: unilin-us.com.
  MX:    mail.unilin-us.com (10)
  A:     mail.unilin-us.com [24.199.x.x]
  A:     e0.ns.voyager.net [169.207.2.72]
  A:     e1.ns.voyager.net [207.89.128.13]
  A:     e2.ns.voyager.net [207.90.100.25]
Checking MX records using UDP: unilin-us.com.
  MX:    mail.unilin-us.com (10)
  A:     mail.unilin-us.com [24.199.x.x]
Both TCP and UDP queries succeeded. Local DNS test passed.

Checking remote domain records.
Starting TCP and UDP DNS queries for the remote domain. This test will try to
validate that DNS is set up correctly for outbound mail. This test can fail for
3 reasons.
    1) Firewall blocks TCP/UDP queries which will block outbound mail. Windows
2000/NT Server requires TCP DNS queries. Windows Server 2003 will use UDP
queries first, then fall back to TCP queries.
    2) Internal DNS does not know how to query external domains. You must
either use an external DNS server or configure DNS server to query external
domains.
    3) Remote domain does not exist. Failure is expected.
Checking MX records using TCP: hexion.com.
  MX:    na-mail1.hexion.com (10)
  MX:    na-mail2.hexion.com (10)
  MX:    eu-mail1.hexion.com (30)
  A:     na-mail1.hexion.com [15.181.0.167]
  A:     na-mail2.hexion.com [15.181.0.169]
  A:     eu-mail1.hexion.com [194.151.75.200]
Checking MX records using UDP: hexion.com.
  MX:    na-mail2.hexion.com (10)
  MX:    eu-mail1.hexion.com (30)
  MX:    na-mail1.hexion.com (10)
Both TCP and UDP queries succeeded. Remote DNS test passed.

Checking MX servers listed for mike.karpinski@hexion.com.
Connecting to na-mail2.hexion.com [15.181.0.169] on port 25.
Received:
220 na-mail2.hexion.com Inbound ESMTP Generic Server (MF)

Sent:
ehlo unilin-us.com

Received:
250-na-mail2.hexion.com Inbound
250-PIPELINING
250-8BITMIME
250-ENHANCEDSTATUSCODES
250 SIZE 104857600


Sent:
mail from: <someone@unilin-us.com>

Received:
250 2.1.0 MAIL ok

Sent:
rcpt to: <mike.karpinski@hexion.com>

Received:
550 5.7.1 Unable to deliver to <mike.karpinski@hexion.com>

Error: Expected "250". Server rejected the recipient address.
Failed to submit mail to na-mail2.hexion.com.
Connecting to na-mail1.hexion.com [15.181.0.167] on port 25.
Received:
220 na-mail1.hexion.com Inbound ESMTP Generic Server (MF)

Sent:
ehlo unilin-us.com

Received:
250-na-mail1.hexion.com Inbound
250-PIPELINING
250-8BITMIME
250-ENHANCEDSTATUSCODES
250 SIZE 104857600


Sent:
mail from: <someone@unilin-us.com>

Received:
250 2.1.0 MAIL ok

Sent:
rcpt to: <mike.karpinski@hexion.com>

Received:
550 5.7.1 Unable to deliver to <mike.karpinski@hexion.com>

Error: Expected "250". Server rejected the recipient address.
Failed to submit mail to na-mail1.hexion.com.
Connecting to eu-mail1.hexion.com [194.151.75.200] on port 25.
Received:
220 eu-mail1.hexion.com Inbound ESMTP Generic Server (MF)

Sent:
ehlo unilin-us.com

Received:
250-eu-mail1.hexion.com Inbound
250-PIPELINING
250-8BITMIME
250-ENHANCEDSTATUSCODES
250 SIZE 104857600


Sent:
mail from: <someone@unilin-us.com>

Received:
250 2.1.0 MAIL ok

Sent:
rcpt to: <mike.karpinski@hexion.com>

Received:
550 5.7.1 Unable to deliver to <mike.karpinski@hexion.com>

Error: Expected "250". Server rejected the recipient address.
Failed to submit mail to eu-mail1.hexion.com.

RE: Error:Expected "250" Server rejected the recp address

I read the report pretty carefully, and it looks like it's the recipient server: eu-mail1.hexion.com that is having trouble. It's supposed to be handling mail for the hexion.com domain, according to the public MX, but it doesn't like the target address.

If possible, I would run SMTPDiag from a workstation in another network and see if the results are any different. I doubt they would be. Have you tried sending an email from an external account, like GMail? What happened? I would expect it to bounce.

ShackDaddy

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