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451 4.4.0 Primary Target error

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  • 451 4.4.0 Primary Target error

    win 2k3 standard x64 bit server 13 of them, two are DC's. one exch 2007 standard serv, x64 on win 2k3 stand x64 bit server.

    I'm having trouble sending e-mails to one particular domain, and I keep getting this error msg in the que.

    451 4.4.0 Target IP address respnded with: "421 4.4.2 connection dropped."attemted failover to alternate host, but that did not succeed.Either there are no alternate hosts, or delivery failed to all other alternate hosts.

    I can e-mail every other freaken domain in the world, ugh!

  • #2
    Re: 451 4.4.0 Primary Target error

    It looks to me like they may be blocking connections from your ip address. I would do three things:

    1. Look in the Exchange logs for the SMTP session to the remote domain so that you can analyze what's happening (helo, mail from, etc).

    2. Telnet to port 25 on the remote system from your Exchange server so that you can see what happens first hand. This might give you more info to go on.

    3. Check to see if your ip address is on any blocklists. You can check this from DNSStuff, MXToolbox, or any number of other web sites.

    Comment


    • #3
      Re: 451 4.4.0 Primary Target error

      Originally posted by joeqwerty View Post
      It looks to me like they may be blocking connections from your ip address. I would do three things:

      1. Look in the Exchange logs for the SMTP session to the remote domain so that you can analyze what's happening (helo, mail from, etc).

      2. Telnet to port 25 on the remote system from your Exchange server so that you can see what happens first hand. This might give you more info to go on.

      3. Check to see if your ip address is on any blocklists. You can check this from DNSStuff, MXToolbox, or any number of other web sites.
      IP address isn't only any blacklist.

      I can telnet to port 25

      the logs just state the same error msgs

      I also ran this cmdlet:

      Get-sendconnector | set-SendConnector -ProtocolLogginglevel verbose

      but it didn't help any, still can't email certain domains.

      Comment


      • #4
        Re: 451 4.4.0 Primary Target error

        When you telnet to port 25 of the remote server are you able to send email to someone at that domain?

        Comment


        • #5
          Re: 451 4.4.0 Primary Target error

          Originally posted by joeqwerty View Post
          When you telnet to port 25 of the remote server are you able to send email to someone at that domain?
          Performing Outbound SMTP Test
          Outbound SMTP Test Successful
          Test Steps
          Attempting reverse DNS lookup for IP 72.91.64.98
          Successfully resolved IP 72.91.64.98 via Reverse-DNS lookup
          Additional Details
          Resolved IP address 72.91.64.98 to host mail.metrohmusa.com
          Performing Real-Time Blackhole List (RBL) Test
          Your IP was not found on any of the block lists checked
          Test Steps
          Checking Block List "SpamHaus Block List (SBL)"
          IP not on block list
          Additional Details
          IP 72.91.64.98 was not found on RBL
          Checking Block List "SpamHaus Exploits Block List (XBL)"
          IP not on block list
          Additional Details
          IP 72.91.64.98 was not found on RBL
          Checking Block List "SpamHaus Policy Block List (PBL)"
          IP not on block list
          Additional Details
          IP 72.91.64.98 was not found on RBL
          Checking Block List "SpamCop Block List"
          IP not on block list
          Additional Details
          IP 72.91.64.98 was not found on RBL
          Checking Block List "NJABL.ORG Block List"
          IP not on block list
          Additional Details
          IP 72.91.64.98 was not found on RBL
          Checking Block List "SORBS Block List"
          IP not on block list
          Additional Details
          IP 72.91.64.98 was not found on RBL
          Checking Block List "MSRBL Combined Block List"
          IP not on block list
          Additional Details
          IP 72.91.64.98 was not found on RBL
          Checking Block List "UCEPROTECT Level 1 Block List"
          IP not on block list
          Additional Details
          IP 72.91.64.98 was not found on RBL
          Checking Block List "AHBL Block List"
          IP not on block list
          Additional Details
          IP 72.91.64.98 was not found on RBL

          Performing Sender ID validation
          Sender ID validation performed successfully
          Test Steps
          Attempting to find SPF record using DNS TEXT record query
          Found SPF Record
          Additional Details
          SPF Record found: "v=spf1 mx mx:in.sjc.mx.trendmicro.com ~all"

          Parsing SPF record and evaluating mechanisms and modifiers
          SPF Record parsed and evaluated successfully
          Test Steps
          Evaluating MX mechanism: "+mx"
          MX mechanism indicated a positive status
          Additional Details
          Matched MX lookup for metrohmusa.com to IP 72.91.64.98

          Comment


          • #6
            Re: 451 4.4.0 Primary Target error

            Originally posted by bigalusn View Post
            Performing Outbound SMTP Test
            Outbound SMTP Test Successful
            Test Steps
            Attempting reverse DNS lookup for IP 72.91.64.98
            Successfully resolved IP 72.91.64.98 via Reverse-DNS lookup
            Additional Details
            Resolved IP address 72.91.64.98 to host mail.metrohmusa.com
            Performing Real-Time Blackhole List (RBL) Test
            Your IP was not found on any of the block lists checked
            Test Steps
            Checking Block List "SpamHaus Block List (SBL)"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "SpamHaus Exploits Block List (XBL)"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "SpamHaus Policy Block List (PBL)"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "SpamCop Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "NJABL.ORG Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "SORBS Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "MSRBL Combined Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "UCEPROTECT Level 1 Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "AHBL Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL

            Performing Sender ID validation
            Sender ID validation performed successfully
            Test Steps
            Attempting to find SPF record using DNS TEXT record query
            Found SPF Record
            Additional Details
            SPF Record found: "v=spf1 mx mx:in.sjc.mx.trendmicro.com ~all"

            Parsing SPF record and evaluating mechanisms and modifiers
            SPF Record parsed and evaluated successfully
            Test Steps
            Evaluating MX mechanism: "+mx"
            MX mechanism indicated a positive status
            Additional Details
            Matched MX lookup for metrohmusa.com to IP 72.91.64.98
            ok I ran a test again but this time to a different domain, it passed but with warnings and this is the domain that I need to e-mail.
            Performing Outbound SMTP Test
            Outbound SMTP Test Successful
            Test Steps
            Attempting reverse DNS lookup for IP 72.91.64.98
            Successfully resolved IP 72.91.64.98 via Reverse-DNS lookup
            Additional Details
            Resolved IP address 72.91.64.98 to host mail.metrohmusa.com
            Performing Real-Time Blackhole List (RBL) Test
            Your IP was not found on any of the block lists checked
            Test Steps
            Checking Block List "SpamHaus Block List (SBL)"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "SpamHaus Exploits Block List (XBL)"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "SpamHaus Policy Block List (PBL)"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "SpamCop Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "NJABL.ORG Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "SORBS Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "MSRBL Combined Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "UCEPROTECT Level 1 Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL
            Checking Block List "AHBL Block List"
            IP not on block list
            Additional Details
            IP 72.91.64.98 was not found on RBL

            Performing Sender ID validation
            Sender ID validation performed successfully
            Test Steps
            Attempting to find SPF record using DNS TEXT record query
            Failed to find SPF record
            Additional Details
            No Records were found

            Comment


            • #7
              Re: 451 4.4.0 Primary Target error

              what I notice is that both connection attempts are looking for an SPF record.
              The dikfference is, in the first log, it finds the SPF record and everything is ok.
              In the second log, it doesn't find the SPF record, so it's rejecting you..


              I'm assuming that metromhusa.com is you ?
              where does the SPF record for trendmicro fit into the equation?

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              Comment


              • #8
                Re: 451 4.4.0 Primary Target error

                actrually. It might even be that there is no MX record for the domain in question ?

                Originally posted by nslookup
                C:\Users\andrew>nslookup
                Default Server: UnKnown
                Address: 192.168.0.1

                > set q=mx
                > google.com
                Server: UnKnown
                Address: 192.168.0.1

                Non-authoritative answer:
                google.com MX preference = 300, mail exchanger = google.com.s9b1.psmtp.com
                google.com MX preference = 400, mail exchanger = google.com.s9b2.psmtp.com
                google.com MX preference = 100, mail exchanger = google.com.s9a1.psmtp.com
                google.com MX preference = 200, mail exchanger = google.com.s9a2.psmtp.com

                google.com.s9b2.psmtp.com internet address = 74.125.148.14
                google.com.s9a1.psmtp.com internet address = 74.125.148.10
                google.com.s9a2.psmtp.com internet address = 74.125.148.11
                google.com.s9b1.psmtp.com internet address = 74.125.148.13
                >

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                • #9
                  Re: 451 4.4.0 Primary Target error

                  Originally posted by tehcamel View Post
                  what I notice is that both connection attempts are looking for an SPF record.
                  The dikfference is, in the first log, it finds the SPF record and everything is ok.
                  In the second log, it doesn't find the SPF record, so it's rejecting you..


                  I'm assuming that metromhusa.com is you ?
                  where does the SPF record for trendmicro fit into the equation?

                  TrendMicro is our spam filter and we set up the SPF record over a year ago. I know my domain works properly. But I can't administer some other companies domain, so how can I resolve this?

                  Comment


                  • #10
                    Re: 451 4.4.0 Primary Target error

                    Originally posted by tehcamel View Post
                    actrually. It might even be that there is no MX record for the domain in question ?

                    I'm pretty sure they have an MX record, been in biz for a long time now.

                    Funny thing is that we have always exchanged (no pun) e-mails up until this week. Very frustrating especially when my CEO can't e-mail there CEO!

                    Comment


                    • #11
                      Re: 451 4.4.0 Primary Target error

                      ok I called Microsoft and they still can't figure this one out.

                      I can't telnet from my Exchange to 205.178.149.7 25 at all.

                      I called Network Solutions since they handle that mx record but they say that my domain isn't on any blacklist or isn't being blocked. Still all e-mails remain in the que and we can't e-mail that domain. Microsoft has helped, my firewall techs have helped, NetSol has helped but nothing. This is truly crazy.

                      Comment


                      • #12
                        Re: 451 4.4.0 Primary Target error

                        ok - here's a suggestion to at leasdt get a workaround in place
                        Speak to your ISP and find out if they'd be comfortable with you using their mailserver as a Smart host.

                        So instead of mail going Outlook -> exchange -> smtp -> outside smtp
                        it goes
                        outlook -> exchange -> smtp -> isp smtp -> outside smtp

                        if that makes sense ?

                        I know it's not a solution, but at least it gets your email working again...

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